I rebuilt my transmission myself and now I don't have drive
03-31-2024, 03:11 PM
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Car: 1986 bitchin camaro iroc-z
Engine: 305 tpi
I rebuilt my transmission myself and now I don't have drive
I know that might sound like I'm just shitty at building transmissions but I have reverse and I read that it takes more pressure to activate reverse than drive but I don't know if I believe it. I was testing it on the lift and when I first put it in drive I heard it try to activate and it spun the tires for a split second but after that it just dipped in rpm and didn't spin the tires at all. if anyone has had a similar experience I would love to hear how you fixed it thank you. any help would be greatly appreciated. 
I forgot to mention it is a 700r4 1986.
I forgot to mention it is a 700r4 1986. Last edited by Riley w; 03-31-2024 at 03:12 PM. Reason: I forgot some information
03-31-2024, 08:37 PM
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Re: I rebuilt my transmission myself and now I don't have drive
I don't have an answer for your problem, but I applaud you for diving in, getting your hands dirty, and trying to learn and do something for yourself. I'm sure you will get some great advice on this forum.
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Riley w (04-06-2024)
03-31-2024, 09:41 PM
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: I rebuilt my transmission myself and now I don't have drive
Does the Vehicle move under it's own power in any Forward Transmission Range (3rd, 2nd, 1st) ?
It moves in Reverse?
Does it hold in the Park Position?
It moves in Reverse?
Does it hold in the Park Position?
04-06-2024, 01:39 AM
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Car: 92 Z28
Engine: Ramjet 350
Transmission: T-56
Axle/Gears: 3.23 Torsen
Re: I rebuilt my transmission myself and now I don't have drive
By rebuild what do you mean? What was replaced? Did you bench test the pump with the input and reverse drum assembled? Most likely the sealing rings on the input drum or valve body issue or pump is shot, could be anything. I have fully rebuilt 2 4l60/700r4s and one 4l60e and never have had an issue. You cannot rush this type of job, it must be perfect. The 86 700r4 needs to be scrapped and you need to source an 89+ 700, Sorry to be the bearer of bad news but you will have to pull it and take it apart again and transplant all your parts into a newer trans.
04-06-2024, 01:35 PM
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Car: 1986 bitchin camaro iroc-z
Engine: 305 tpi
Re: I rebuilt my transmission myself and now I don't have drive
yes the car moves under its own weight in reverse and holds park but it does not have any forward gear but when I first put it in gear the tires moved a little but then lost all power
04-06-2024, 01:38 PM
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Car: 1986 bitchin camaro iroc-z
Engine: 305 tpi
Re: I rebuilt my transmission myself and now I don't have drive
by rebuild I mean I was driving one day and the spray gear in the back of the trans blew up completely but didn't hurt the case but while I was in there I put in new clutches and steels but other than that everything is as it was the job was not rushed and I did test the pump and I vacuum tested and air tested through the entire build
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04-09-2024, 10:35 PM
#10
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Re: I rebuilt my transmission myself and now I don't have drive
By rebuild what do you mean? What was replaced? Did you bench test the pump with the input and reverse drum assembled? Most likely the sealing rings on the input drum or valve body issue or pump is shot, could be anything. I have fully rebuilt 2 4l60/700r4s and one 4l60e and never have had an issue. You cannot rush this type of job, it must be perfect. The 86 700r4 needs to be scrapped and you need to source an 89+ 700, Sorry to be the bearer of bad news but you will have to pull it and take it apart again and transplant all your parts into a newer trans.
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vorteciroc (04-10-2024)
04-10-2024, 02:41 PM
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Car: Resto-Mod 1987 IROC-Z Clone
Engine: Alky fed L92 Vortec Twin-Turbo 6.8L
Transmission: My own built/ design 4L80M
Axle/Gears: Custom 12 bolt (4.10:1)
Re: I rebuilt my transmission myself and now I don't have drive
The Forward Clutch is not Holding (Low Pressure and/ or burn Clutches).
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