The Rodding Roundtable
Motorhead Message Central => Rodder's Roundtable => Topic started by: entodad on January 10, 2007, 11:10:01 AM
Having opened two trannys recently both with the same rear planatary shell torn up, and one with the rear sprag all ripped apart. What is a recommended upgrade there. I see 5 pinion rear planet sets, and also a rear shell called the beast...are these good upgrades or are they unnecessary for putting a little hp/torque through the tranny.
Also what else would be good to do...
I expect the engine will develop about 350-450 hp and have maybe 300-400 ft-lbs of torque 355 CID chevy
Thanks in advance
Doug :shock:
bump
Quote from: "entodad"Having opened two trannys recently both with the same rear planatary shell torn up, and one with the rear sprag all ripped apart. What is a recommended upgrade there. I see 5 pinion rear planet sets, and also a rear shell called the beast...are these good upgrades or are they unnecessary for putting a little hp/torque through the tranny.
Also what else would be good to do...
I expect the engine will develop about 350-450 hp and have maybe 300-400 ft-lbs of torque 355 CID chevy
Thanks in advance
Doug :shock:
Your term planetary shell is incorrect If I am thinking about the same part.
THe drive shell ( stamped steel unit) can be trouble. The 'beast " drive shell is worth the $ , IMHO. Follow the instructions! I have never seen one broken, even a 4L65E unit I have pressed ( BF-hammer) the guts apart for an inspection.
Rear planet failure where the gear teeth are rounded off, black/blue metal
Is from lube problems. 4 pinion planets are fine. ALL bushings must be tight or replaced for proper lube flow.
I would suggest the Raybestos Z-Pack for the 3/4 clutch pack. Follow instructions!
I would suggest to remove the check ball capsule from the 2-4 servo bore..... install a t-350 cup plug ( TRANSTAR # 13970) into the case to block off the hole... Firms up the 2-3 shift.
Vette servo is good upgrade. Keep shift holes stock for 1-2 in a light car. Open 3rd gear hole to .093 with above mods.
add a check ball to the line bias valve spring (in the bore first , then spring , then valve) ..... run a .422 main boost valve. Low / reverse boost valve run a .282 unit.
Run a 10 vane pump. .0015 clearance works well.
Did I mention replace the bushings?
Depending on year of tranny and pump design there are more mods to perform.
:wink: :wink:
Great stuff Tony, thanks :D ,
Sum
Quote from: "Crosley"Quote from: "entodad"Having opened two trannys recently both with the same rear planatary shell torn up, and one with the rear sprag all ripped apart. What is a recommended upgrade there. I see 5 pinion rear planet sets, and also a rear shell called the beast...are these good upgrades or are they unnecessary for putting a little hp/torque through the tranny.
Also what else would be good to do...
I expect the engine will develop about 350-450 hp and have maybe 300-400 ft-lbs of torque 355 CID chevy
Thanks in advance
Doug :shock:
Your term planetary shell is incorrect If I am thinking about the same part.
THe drive shell ( stamped steel unit) can be trouble. The 'beast " drive shell is worth the $ , IMHO. Follow the instructions! I have never seen one broken, even a 4L65E unit I have pressed ( BF-hammer) the guts apart for an inspection.
Rear planet failure where the gear teeth are rounded off, black/blue metal
Is from lube problems. 4 pinion planets are fine. ALL bushings must be tight or replaced for proper lube flow.
I would suggest the Raybestos Z-Pack for the 3/4 clutch pack. Follow instructions!
I would suggest to remove the check ball capsule from the 2-4 servo bore..... install a t-350 cup plug ( TRANSTAR # 13970) into the case to block off the hole... Firms up the 2-3 shift.
Vette servo is good upgrade. Keep shift holes stock for 1-2 in a light car. Open 3rd gear hole to .093 with above mods.
add a check ball to the line bias valve spring (in the bore first , then spring , then valve) ..... run a .422 main boost valve. Low / reverse boost valve run a .282 unit.
Run a 10 vane pump. .0015 clearance works well.
Did I mention replace the bushings?
Depending on year of tranny and pump design there are more mods to perform.
:wink: :wink:
Bushings are to be replaced, I have a z-pack already, a transgo shift kit (blue box) is ready to go, I also boutht a corvete servo. a new transgo separator plate, new front and rear sprags, new bushings, thrust washers, 0.500 boost valve (o-ringed), an o-ringed low/reverse valve, a sonnax accumulator spring, and now I will add a new drive shell (beast) and I will keep the 4 pinion planet.....I think that is all so far....geeze this is getting expensive......but it should be worth it
Thanks Crosley!
Doug