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Search: Posts Made By: big gear head
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Forum: Transmissions and Drivetrain
07-13-2019, 12:53 AM
Replies: 4
Views: 1,261
Posted By big gear head

Re: Pilot bushing or bearing

Depends on what transmission you use. Some transmissions are designed to be used with a bearing, but the older transmissions may not last long with bearing. The quality of the bushings today has...
Forum: Transmissions and Drivetrain
07-01-2019, 06:54 AM
Replies: 11
Views: 3,079
Posted By big gear head

Re: Rear differential leak question

There was a thread on here not long ago about someone who was trying to find a new rubber plug. I can't remember if they were able to find one or not.
Forum: Transmissions and Drivetrain
06-30-2019, 08:04 PM
Replies: 11
Views: 3,079
Posted By big gear head

Re: Rear differential leak question

Almost every 9 bolt that I have seen had the Borg Warner limited slip differential, Your pictures are not showing up for me.
Forum: Transmissions and Drivetrain
06-25-2019, 02:47 PM
Replies: 1
Views: 1,592
Posted By big gear head

Re: 99 sonoma zr2 NV 3500 swap to a 94 chevy 1500 T5

This is a 3rd gen Camaro Firebird sight, not a truck sight.
Forum: Transmissions and Drivetrain
06-13-2019, 08:36 PM
Replies: 5
Views: 4,395
Posted By big gear head

Re: 9-Bolt M78 rebuild for under 300 dollars

Torco is the best oil to use in the 9 bolt, but others work. Most of the time the additive is needed.
Forum: Transmissions and Drivetrain
06-13-2019, 08:29 AM
Replies: 6
Views: 2,336
Posted By big gear head

Re: Blown 3:45 Ratio 9 Bolt - thoughts?

Rebuilding it might seem like more than you want to take on, but I believe that you can do it. From what I understand the 3.45 is not available new, so you would probably have to set up a used gear....
Forum: Transmissions and Drivetrain
06-13-2019, 06:44 AM
Replies: 6
Views: 2,336
Posted By big gear head

Re: Blown 3:45 Ratio 9 Bolt - thoughts?

So do you think that the 9 bolt is not strong enough to handle what you are doing with it? Do you think that you need to upgrade to a stronger rear end, or do you think that this is just something...
Forum: Transmissions and Drivetrain
06-12-2019, 03:41 PM
Replies: 6
Views: 2,336
Posted By big gear head

Re: Blown 3:45 Ratio 9 Bolt - thoughts?

What part of it is broke?
Forum: Transmissions and Drivetrain
06-07-2019, 09:57 AM
Replies: 10
Views: 2,838
Posted By big gear head

Re: rebuilding rear end at home...possible??

The 9 bolt is actually a little better rear end, but it will probably be more expensive to rebuild. The Borg Warner differential in it can be reconditioned, but requires some machine work. There is a...
Forum: Transmissions and Drivetrain
06-02-2019, 09:27 AM
Replies: 4
Views: 3,337
Posted By big gear head

Re: 10 bolt 3.23, swap gears inside?

Pinion depth adjustments are made with shims and must be accurate within +/- .001 inch. Pinon bearing preload must be set to within +/- 2 inch pounds. Backlash is set with shims and must be set to...
Forum: Transmissions and Drivetrain
06-01-2019, 09:51 PM
Replies: 4
Views: 3,337
Posted By big gear head

Re: 10 bolt 3.23, swap gears inside?

You may already know this, but swapping gears is a lot more than just taking one out and putting another one in. There is a lot of set up involved. Pinion depth, bearing preload and backlash must be...
Forum: Transmissions and Drivetrain
05-31-2019, 06:47 AM
Replies: 1
Views: 1,899
Posted By big gear head

Re: Need help GTA 9 bolt

That oil should work fine. There is no yellow metal in the 9 bolt, so it won't hurt anything. You may still need the additive. I found that Torco oil works best with the Borg Warner differential.
Forum: Transmissions and Drivetrain
05-30-2019, 12:16 PM
Replies: 4
Views: 1,849
Posted By big gear head

Re: Thick gears?

OK, just be careful with it. I've seen several of these break, mostly in the 7.5 rear ends.
Forum: Transmissions and Drivetrain
05-30-2019, 09:28 AM
Replies: 4
Views: 1,849
Posted By big gear head

Re: Thick gears?

The thick gear might be a little stronger due to it being more rigid, but it will also have more rotating mass. Most racers want to reduce rotating mass as much as possible. Mini spools are not very...
Forum: Transmissions and Drivetrain
05-28-2019, 06:25 PM
Replies: 8
Views: 2,367
Posted By big gear head

Re: Richmond 3.42 ring and pinion loud during operation

With 1000 miles on them and the noise that he is describing, I don't think there is much hope for making them quiet. It's possible, but not likely.
Forum: Transmissions and Drivetrain
05-28-2019, 05:13 PM
Replies: 8
Views: 2,367
Posted By big gear head

Re: Richmond 3.42 ring and pinion loud during operation

I'm guessing that the damage is already done.
Forum: Transmissions and Drivetrain
05-28-2019, 12:38 PM
Replies: 8
Views: 2,367
Posted By big gear head

Re: Richmond 3.42 ring and pinion loud during operation

Pinion depth, backlash and bearing preload must be set correctly for the gears to mesh properly. If anything is not set correctly then you will have noise. It's probably not the fault of the gears....
Forum: Transmissions and Drivetrain
05-26-2019, 08:00 PM
Replies: 4
Views: 2,157
Posted By big gear head

Re: 9 bolt yoke help

Did the bearings get tight when you tightened the pinion nut? If they did then it's probably right.
Forum: Transmissions and Drivetrain
05-26-2019, 03:00 PM
Replies: 4
Views: 2,157
Posted By big gear head

Re: 9 bolt yoke help

You didn't install the crush spacer yet did you? If you did then remove it and save it for the final assembly.
Forum: Transmissions and Drivetrain
05-21-2019, 06:40 AM
Replies: 4
Views: 639
Posted By big gear head

Re: Anyone know what this is?

Borg-Warner LSD for a 9 bolt.

EDIT. I was wrong about this. It's not a BW, it's the old style Auburn that bolts together instead of having the cap on the end. It can not be rebuilt. I need to take...
Forum: Transmissions and Drivetrain
05-17-2019, 09:35 PM
Replies: 10
Views: 1,173
Posted By big gear head

Re: Need help to ID this rear end

Yeah, I got the 3.27 and 3.45 mixed up. There is a 3.45, right?
Forum: Transmissions and Drivetrain
05-17-2019, 02:28 PM
Replies: 10
Views: 1,173
Posted By big gear head

Re: Need help to ID this rear end

Borg Warner 9 bolt. Almost all of them had the Borg Warner cone type LSD in them. 3.25 was an available gear ratio.
Forum: Transmissions and Drivetrain
04-15-2019, 07:08 PM
Replies: 40
Views: 3,327
Posted By big gear head

Re: I need a 9 bolt oil diff plug

For the Dodge https://www.dormanproducts.com/p-18261-65340.aspx
Forum: Transmissions and Drivetrain
04-15-2019, 03:15 PM
Replies: 40
Views: 3,327
Posted By big gear head

Re: I need a 9 bolt oil diff plug

Try one for the Dodge truck rear end. Some Jeeps use a plug like that too.
Forum: Transmissions and Drivetrain
04-10-2019, 04:20 PM
Replies: 1
Views: 313
Posted By big gear head

Re: Limited slip differential

First you need to know what the gear ratio is. Your car should have the 7.5 GM rear end, which has 26 spline axles and the carrier breaks are between 3.23 and 3.08. You will need either a 2 series or...
Forum: Transmissions and Drivetrain
04-07-2019, 02:05 PM
Replies: 5
Views: 1,377
Posted By big gear head

Re: Rear Differential gear oil change

About 2 quarts of gear oil and a 4 oz bottle of the additive. Put the additive in the first bottle of gear oil and then squirt it in.
Forum: Transmissions and Drivetrain
04-01-2019, 06:44 AM
Replies: 12
Views: 2,409
Posted By big gear head

Re: ‘88 IROC 3:08 Posi to 3:73 w/S10 gears?

You would have to replace the axles with '90-'92 28 spline axles.
Forum: Transmissions and Drivetrain
03-31-2019, 03:49 PM
Replies: 12
Views: 2,409
Posted By big gear head

Re: ‘88 IROC 3:08 Posi to 3:73 w/S10 gears?

The QP kit has a Yukon Dura Grip differential, USA Standard installation kit and the gears will probably be from Motive. These are all quality parts that I normally recommend for moderate performance...
Forum: Transmissions and Drivetrain
03-31-2019, 09:51 AM
Replies: 12
Views: 2,409
Posted By big gear head

Re: ‘88 IROC 3:08 Posi to 3:73 w/S10 gears?

This is the best deal that I know of with good parts in it. https://www.quickperformance.com/GM-75-7625-10-Bolt-Posi-Gears-Bearing-Kit_p_20409.html
Forum: Transmissions and Drivetrain
03-04-2019, 04:56 PM
Replies: 3
Views: 2,224
Posted By big gear head

Re: 10 bolt to 9 bolt/10 bolt noises

Check the pinion nut to see if it's tight. It's a common problem for the pinion nut to back off and cause the noise that you are hearing. This is an easy thing to check. If the nut is tight then you...
Forum: Transmissions and Drivetrain
02-17-2019, 02:03 PM
Replies: 16
Views: 797
Posted By big gear head

Re: Pinion Seal - Thirdgen rear w/4th gen torsen diff

Torquing the pinion nut to 150 foot pounds is a good way to set the bearings when you are replacing the pinion seal. There is no reason to completely disassemble the rear end just so that you can...
Forum: Transmissions and Drivetrain
02-15-2019, 09:39 PM
Replies: 8
Views: 514
Posted By big gear head

Re: 1990 Camaro Z28 Differential questions

If the '90 rear end is the GM 10 bolt then it takes the same axle bearings as all of the GM 10 bolt car rear ends. If it has a 2.73 gear then it's a 2 series differential and will require the thick...
Forum: Transmissions and Drivetrain
02-02-2019, 07:28 AM
Replies: 18
Views: 1,225
Posted By big gear head

Re: Hawks Ring and Pinion Set?

The 9 bolt will have the 2.77 gear, which means you have a 2 series Borg Warner limited slip differential. If you install a 3.45 then you will have to get a 3 series differential. There is a Truetrac...
Forum: Transmissions and Drivetrain
02-01-2019, 06:46 AM
Replies: 18
Views: 1,225
Posted By big gear head

Re: Hawks Ring and Pinion Set?

It doesn't say what brand that gear is. You might want to check out Quick Performance.
Forum: Transmissions and Drivetrain
01-28-2019, 12:16 PM
Replies: 2
Views: 744
Posted By big gear head

Re: 9-bolt Yoke vs 10-bolt Yoke

The yokes are not the same. Yes, remove and install should be the same.
Forum: Transmissions and Drivetrain
01-19-2019, 09:34 PM
Replies: 12
Views: 880
Posted By big gear head

Re: 3.00 vs 3.50

The 3.50 was a factory for ratio in the 9 inch and there were millions of them made. They lasted for hundreds of thousands of miles in F100s F150s and Ford cars. Most of them never got the oil...
Forum: Transmissions and Drivetrain
01-19-2019, 09:31 PM
Replies: 3
Views: 464
Posted By big gear head

Re: Aftermarket Auburn vs Factory Auburn

If you drive it like most mature people drive then it will last pretty well. If you drive it like someone normally drives a hot rod then it won't last a long time. You will need to add a lot of...
Forum: Transmissions and Drivetrain
01-18-2019, 06:39 AM
Replies: 12
Views: 880
Posted By big gear head

Re: 3.00 vs 3.50

Since you have an overdrive transmission you will probably like the 3.50 better. I would recommend putting a Eaton Truetrac in it too.
Forum: Transmissions and Drivetrain
01-14-2019, 06:37 AM
Replies: 5
Views: 482
Posted By big gear head

Re: Aftermarket 28 Spline Axle Shafts 10 Bolt?

A replacement axle for a '90 to '92 3rd gen should work fine. Moser, Yukon or others should have them.
Forum: Transmissions and Drivetrain
12-25-2018, 09:20 AM
Replies: 17
Views: 823
Posted By big gear head

Re: 9" Rear End

Yes, you need a differential for 28 spline axles, if you are sure that you have 28 spline axles. The 28 spline axles were not used until '89 or '90, so if you have an earlier rear end with those...
Forum: Transmissions and Drivetrain
12-24-2018, 03:56 PM
Replies: 17
Views: 823
Posted By big gear head

Re: 9" Rear End

If you have a 28 spline 10 bolt, and it has gears somewhere between 3.23 and 4.56, then you just need a 3 series limited slip differential of some kind. The Eaton Truetrac is a very popular choice....
Forum: Transmissions and Drivetrain
12-22-2018, 08:46 PM
Replies: 17
Views: 823
Posted By big gear head

Re: 9" Rear End

Thanks for the picture. I've always doubted that they existed, but now I believe.
Forum: Transmissions and Drivetrain
12-20-2018, 10:53 PM
Replies: 17
Views: 823
Posted By big gear head

Re: 9" Rear End

You can add a Eaton Posi, Eaton Truetrac, Yukon Dura Grip or other limited slip differential to the 10 bolt, but I wouldn't stay with the smaller 26 spline axles. I would upgrade the whole thing to...
Forum: Transmissions and Drivetrain
12-20-2018, 06:24 PM
Replies: 17
Views: 823
Posted By big gear head

Re: 9" Rear End

Yeah, you are getting 9 bolt and 10 bolt parts mixed up. The 3.70 gear is for a 9 bolt Borg Warner rear end, not the GM 10 bolt. If you have a rear end with 26 spline axLEs then it's a 10 bolt. I...
Forum: Transmissions and Drivetrain
12-17-2018, 10:29 AM
Replies: 33
Views: 3,414
Posted By big gear head

Re: Seeking some advice/input before ordering a Moser 12 Bolt

2.5 offset is Ford and 2.75 is GM. If you were going to run Ford brakes then you would need the 2.5 offset.
Forum: Transmissions and Drivetrain
12-17-2018, 09:18 AM
Replies: 5
Views: 635
Posted By big gear head

Re: Gear ratio

Yeah, it's that simple. Count and divide.
Forum: Transmissions and Drivetrain
12-17-2018, 09:15 AM
Replies: 9
Views: 1,260
Posted By big gear head

Re: Removing pinion nut - Rear OUT of car

I used a large pipe wrench for many years before I made my tool for holding the yoke. Drilling holes in a piece of angle iron also works well. You will need a 1 1/4 inch socket for the nut. A good...
Forum: Transmissions and Drivetrain
12-14-2018, 01:46 PM
Replies: 33
Views: 3,414
Posted By big gear head

Re: Seeking some advice/input before ordering a Moser 12 Bolt

Yes, you can do that, but the seals in the bearings are not that great either and they leak. I just prefer the Moser ends. I'm eventually going to use a S60 in a Chevelle, but I'm going to order it...
Forum: Transmissions and Drivetrain
12-14-2018, 09:13 AM
Replies: 33
Views: 3,414
Posted By big gear head

Re: Seeking some advice/input before ordering a Moser 12 Bolt

The reason that the Strange rear end leaks oil around the axle bearings is because their housing ends don't accept a stock Ford axle seal. They rely on the O ring around the outside of the bearing to...
Forum: Transmissions and Drivetrain
12-13-2018, 11:18 PM
Replies: 33
Views: 3,414
Posted By big gear head

Re: Seeking some advice/input before ordering a Moser 12 Bolt

The aluminum girdle cover is not needed with the Moser 12 bolt. If you like the look of it then that's fine, but the Moser 12 bolt is so much stronger than a Chevy 12 bolt that the cover is...
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