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t56's: LS1 vs LT1

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Old 04-23-2013, 06:25 PM
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Car: 85 Trans Am
Engine: 98 Vortec 350 LT1 Cam w/ TPI
Transmission: T56
Axle/Gears: 9 bolt 3:27
Re: t56's: LS1 vs LT1

Just wanted to add that on the factory 5 spd and cruise equipped cars there was a switch on the clutch much like the brake switch. This is so the cruise will disengage when the clutch is depressed. On the factory car the clutch and brake switches were wired in line with each other. So if either one broke the circuit cruise was shut off. I would make sure this works if you use cruise as cruise + clutch released can = disaster.

3rd gens use both electrical and vacuum dumps for cruise release. The primary is electrical and if that fails there is the vacuum dump. However only the brake has the vacuum dump

As for clutch safety switch mine is bypassed, I was taught the old school way to shake the shifter in neutral before starting. Plus it is less wear on the thrust bearing in the motor on the crank not having clutch pressure against it on startup.

Also as far as switch design only the early 3rd gens had the white switch. Later years got the same switch as found on 4th gen pedals.
Old 04-23-2013, 10:29 PM
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Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: t56's: LS1 vs LT1

Originally Posted by LilSki
3rd gens use both electrical and vacuum dumps for cruise release. The primary is electrical and if that fails there is the vacuum dump. However only the brake has the vacuum dump
This is the exact question I had lurking in the back of my mind. If only the vacuum shut off the cruise or if there was an electrical shutoff also.

Thank You for posting this.

Last edited by Keoman; 04-25-2013 at 02:46 PM.
Old 04-26-2013, 05:49 PM
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Re: t56's: LS1 vs LT1

Got one! Finally!
From a 96 Formula, 141k



Old 05-25-2013, 12:59 AM
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Car: 1991 Camaro RS
Engine: 305 will be LSX eventually
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Re: t56's: LS1 vs LT1

how is the swap going? Just blew up my trans and am looking to do the same thing. Found a lot of answers to my questions in this thread!
Old 05-28-2013, 03:05 PM
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Car: 1989 IROC & ROLL-Z
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Transmission: T56, Mech Speedo
Axle/Gears: G92 J65 3.27
Re: t56's: LS1 vs LT1

The swap went great!! Took 2 days to complete everything from very start to finish but I had access to a lift to remove the 700r4.

Defiantly the best mod I have done to my car. Just took a trip to a town near vegas to ride my bike over memorial weekend and had ZERO problems with the trans.
Avg MPG was around 26 which was just a + to how awesome the car feels now.

There are a couple important things I never came across in other threads so I posted this in the t56 swap thread: (Lots of answers to common questions in there)
https://www.thirdgen.org/forums/tran...ap-thread.html

Got my swap done in 2 days. Thanks for the write up, always makes things easier when you know where to get the answers right away.
Ended up at $2389 with new hydraulics, clutch kit and flywheel. Trans was $1063 at the pic'n'pull. Alloy (aka Dan) also converted my tail housing to mech speedo and it works great.

One thing I noticed is that the factory t56 mount and the factory 700r4 mount are different heights. You need to ask the manufacturer of your cross member, but hawks told me that they designed their long tube xmember for the factory t56 mount. It is about 1/4" - 1/2" shorter than the 700r4 mount. It actually made the trans sit weird in the car so I took it out and compared them, sure enough, they were different. I am using the stock rubber mount for now. Will change soon.

For the cruise control, I got a spare vacuum switch from another thirdgen at the JY and put a "T" on the vacuum line and wired them in series. Works like a charm.

Originally Posted by vbMike
I just used a couple of spade connectors and stuck them into the factory harness and then ran wires to the clutch pedal.
I used this method and it worked great. I had to take the spades to the bench grinder to shorten the width a bit but all turned out well.

I used a 6.5" short shift stick. Works fantastic. Had to shim the shifter over about 1 1/2" to get it centered in the console hole.

I cut 1 1/2" turns from the reverse solenoid spring starting from the very end of the coil and it wasn't enough. I am going to disassemble it one more time and cut another full turn out.

Pics



Cant remember bolt diameter/thread count but they are 1 1/2" long, worked great with 8 washers.


Factory lower shift boot


Had to fold the upper boot down because of the short stick. Doesn't look bad, IMO.
Old 05-28-2013, 05:40 PM
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Re: t56's: LS1 vs LT1

Nice to hear lol its a totally different beast crazy how just a trans swap changes the way it feels

might not be faster but it feels like it and feels alot more sportier and fun
Old 05-28-2013, 11:11 PM
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Re: t56's: LS1 vs LT1

Agreed!
Time to save some coin for the engine LOL
that might be a while

Old 05-28-2013, 11:15 PM
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Re: t56's: LS1 vs LT1

Manual be it T5 or T56 totally changes the way the car feels from an automatic. Throttle input is so much more direct and responsive.

I now do not own a single automatic car because I'm just that against auto's for me. People say manuals are a pain in traffic, but really they aren't.
Old 05-29-2013, 01:36 AM
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Re: t56's: LS1 vs LT1

Originally Posted by Keoman
Cant remember bolt diameter/thread count but they are 1 1/2" long, worked great with 8 washers.
Given time, that "setup" (and I use that term loosely) is going to wobble like an old hockey player with a pimp cane.

The OEM steel strapped handle or a Hurst splined connection are the way to go. Pro-5.0 wobbles around if the bolts loosen as well.
Old 05-29-2013, 11:20 AM
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Re: t56's: LS1 vs LT1

Originally Posted by Keoman
Agreed!
Time to save some coin for the engine LOL
that might be a while

I would just upgrade intake and cam and heads if you really want to get into it lol in the upper rpm levels

Originally Posted by Thirdgen89GTA
Manual be it T5 or T56 totally changes the way the car feels from an automatic. Throttle input is so much more direct and responsive.

I now do not own a single automatic car because I'm just that against auto's for me. People say manuals are a pain in traffic, but really they aren't.
unless its los angeles traffic then you dont know the real pain in traffic lol
Top 5 traffic cities
1 Los Angeles
2 Honolulu
3 San Francisco
4 Austin
5 New york
Old 05-29-2013, 01:49 PM
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Re: t56's: LS1 vs LT1

Originally Posted by jmd
Given time, that "setup" (and I use that term loosely) is going to wobble like an old hockey player with a pimp cane.

The OEM steel strapped handle or a Hurst splined connection are the way to go. Pro-5.0 wobbles around if the bolts loosen as well.
Given the nature of how the stick attaches to the shifter any stick could wobble after a time. its just two bolts.

One word to fix it: loctite.
Old 05-29-2013, 10:31 PM
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Re: t56's: LS1 vs LT1

Originally Posted by Thirdgen89GTA
Given the nature of how the stick attaches to the shifter any stick could wobble after a time. its just two bolts.

One word to fix it: loctite.
An double bend offset stick with a secondary alignment system like I mentioned would be a fix.

Leaving the washer stack and locktiting it would be the same as throwing a temper tantrum and screaming at the top of your lungs "I WANNA GIVE CAMARO OWNERS A BAD NAME."

Or a good way to give the next owner of the car a really solid reason to at the work performed.

Let's not abuse the word fix in the future.
Old 05-29-2013, 11:28 PM
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Re: t56's: LS1 vs LT1

Haha I knew I should have never posted that picture. Knew for sure it was gonna rub someone the wrong way.

I did loctite the bolts... if anyone cares.

There wont ever be a "next owner" as long as I'm around.

By the time that "setup" wears out I'll have one of these anyways.

Old 05-29-2013, 11:31 PM
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Re: t56's: LS1 vs LT1

Originally Posted by Zach/90\irocZ
I would just upgrade intake and cam and heads if you really want to get into it lol in the upper rpm levels
Yeah but that stuff you listed there can cost quite a bit!

At least for a college dweeb with a part time job
Old 05-30-2013, 09:11 AM
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Re: t56's: LS1 vs LT1

Originally Posted by Keoman
Yeah but that stuff you listed there can cost quite a bit!

At least for a college dweeb with a part time job
lol true it does cost $$$
im no rich guy..military pay isnt that good either and compared to my civilian counter parts and i do more than work pay could be alot much better
most stuff i get is thru trading, selling and thirdparty used stuff thats

as for your shifter what are you planning to run pro 5.0 , Hurst, Mgw
i had pro 5.0 very notchy and you def know when you in gear or not i wouldnt say its the best shifter out of the 3 as i havent really tested all 3
but i like the postive feel
Old 05-30-2013, 04:28 PM
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Re: t56's: LS1 vs LT1

I have heard/read tons of great things about the MGW i posted above. It'll either be that or the Pro5.0 in the future. I guess cost will have a factor also but either way, if I get one and don't like it, I'll switch.
Old 05-30-2013, 05:47 PM
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Re: t56's: LS1 vs LT1

Originally Posted by Keoman
I have heard/read tons of great things about the MGW i posted above. It'll either be that or the Pro5.0 in the future. I guess cost will have a factor also but either way, if I get one and don't like it, I'll switch.
Check ls1tech might catch a smoking deal lol
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