95Noobie
I'm Awesome
I'm way overdue for an update but the transmission rebuild turned into a several month mess. The first guy got injured halfway through the rebuild and had a friend come and 'finish' but ended up cracking the pump while reinstalling (apparently the torque converter was not in correct position when tranny was bolted back in). Then during disassembly and repair of the cracked pump plus putting the pump cover back on one of the bolt holes on the housing had a chunk of aluminum crack off right at the threads so the case became unusable. Gave up on that shop, flatbed to another shop, sourced a used late 1995 case online and had the new shop take everything out and start over.
Originally we always had a firm 1-2 shift but reason for rebuild was difficulty in getting reverse to apply. It would engage on level ground but trying to reverse with a slight load or go up a slight grade it would slip.
The new guy got new gasket kit and some new 'steels' and put it back together.. He ran into a few other minor issues, reinstalled and still had weak reverse. Took it all back out and found a C clip not positioned exactly in one of the small holes and corrected that and then reverse was good. He put in a corvette servo and also used a reman oem torque converter. We picked it up last night and noticed the 1-2 very firm shift is still there. Feels just like before.
I put in a sonnax pinless accumulator. When we got the truck there were 3 springs in the accumulator, one smaller very strong spring and 2 larger weaker ones. I replaced with the stock GM larger purple weaker spring and smaller stronger yellow spring.
Since the firm shift seems identical before and after the rebuild I'm thinking the corvette servo may not be to blame here although I've read it can give a chirping tires between one and two and some 'like that' feature. I'm looking for smooth shifting if possible.
I've also read that in this case since the piston is against the separator plate then comes springs and there is no piston and piston hole is sealed that a firmer spring would give a softer shift.
The first tranny guy before he was injured was mentioning that he often puts a stack of 3 standard hardware nuts (I forget the size maybe he said nuts for a 7/16" size bolt?) in the accumulator instead of a spring so that the piston can't move very far at all which would be like a very VERY firm spring and helps give a smooth shift.
I'm working on the idea that a completely rebuilt tranny and valve body with new solenoids and no worn steel or bands etc that still gives a rough shift would then go back to the line pressure the corvette servo or the accumulator springs.
I plan to drop the pan (again!) and replace the 2 oem springs with something and looking for advice!
Thanks in advance!
Originally we always had a firm 1-2 shift but reason for rebuild was difficulty in getting reverse to apply. It would engage on level ground but trying to reverse with a slight load or go up a slight grade it would slip.
The new guy got new gasket kit and some new 'steels' and put it back together.. He ran into a few other minor issues, reinstalled and still had weak reverse. Took it all back out and found a C clip not positioned exactly in one of the small holes and corrected that and then reverse was good. He put in a corvette servo and also used a reman oem torque converter. We picked it up last night and noticed the 1-2 very firm shift is still there. Feels just like before.
I put in a sonnax pinless accumulator. When we got the truck there were 3 springs in the accumulator, one smaller very strong spring and 2 larger weaker ones. I replaced with the stock GM larger purple weaker spring and smaller stronger yellow spring.
Since the firm shift seems identical before and after the rebuild I'm thinking the corvette servo may not be to blame here although I've read it can give a chirping tires between one and two and some 'like that' feature. I'm looking for smooth shifting if possible.
I've also read that in this case since the piston is against the separator plate then comes springs and there is no piston and piston hole is sealed that a firmer spring would give a softer shift.
The first tranny guy before he was injured was mentioning that he often puts a stack of 3 standard hardware nuts (I forget the size maybe he said nuts for a 7/16" size bolt?) in the accumulator instead of a spring so that the piston can't move very far at all which would be like a very VERY firm spring and helps give a smooth shift.
I'm working on the idea that a completely rebuilt tranny and valve body with new solenoids and no worn steel or bands etc that still gives a rough shift would then go back to the line pressure the corvette servo or the accumulator springs.
I plan to drop the pan (again!) and replace the 2 oem springs with something and looking for advice!
Thanks in advance!