What would cause the tranny to NOT shift?
#1
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Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
What would cause the tranny to NOT shift?
I have been running a 700R4 in my '87 since day 1. When I installed the 395 stroker motor, I also purchased a Pro-Built 700R4 (put my factory 700R4 in the corner of the garage). I used the govenor out of my factory 700R4 in the Pro-Built 700R4. The tranny has been shifting just about right for me at WOT at about 6,000 RPM. But now it wont shift. I have been hitting the rev limiter of 6800 RPM several times now. What would be the root cause for this? I have checked the tranny fluid level while hot and it read the correct level for hot.
Can I make a small adjustment to the detent cable to get the tranny to shift at 6,000 instaed of hitting the rev limiter? If yes, which way to go on the adjustment?
I am going out to recheck the fluid level.
Any help would be appreciated.
Can I make a small adjustment to the detent cable to get the tranny to shift at 6,000 instaed of hitting the rev limiter? If yes, which way to go on the adjustment?
I am going out to recheck the fluid level.
Any help would be appreciated.
#2
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Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Re: What would cause the tranny to NOT shift?
One thing that I did was to replace the rear tranny mount from a rubber factory type to a polyeruthane unit. This pushes the rear end of the tranny up 1/2" to 1" higher than the factrory location. Maybe this has caused the detent cable to act different. What do you guys think?
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Car: 89 Iroc
Engine: 350/Dart heads/hotcam/TPI
Transmission: T56
Axle/Gears: 3.45 9bolt
Re: What would cause the tranny to NOT shift?
Pull your govenor back out and look at the gear. It sounds like you have stripped the plastic teeth.
#4
Re: What would cause the tranny to NOT shift?
Is it doing this in all gears? mine wouldnt shift from 2-3 once and it was because I burned the clutch packs for the 3-4 gears. Dont expect this to be a problem for your fresh tranny but you never know.
Does sound like a govenor problem
Does sound like a govenor problem
#5
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Car: '87 IROCZ
Engine: 395 ZZ4
Transmission: ProBuilt 700R4
Axle/Gears: 9 bolt 3.70s
Re: What would cause the tranny to NOT shift?
Thank you for the replies. I have solved the problem of no up-shifting. I had installed a polyurethane rear tranny mount, replacing the weak rubber factory type. The new unit lifted the rear end of the tranny about 1/2" or more, causing the detent cable to be out of adjustment. All I had to do was to push the detent cable forward thru the mounting backet on the side of the intake plenum about 1/8".... I did it to myself!
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