Auto Trans rebuild - ZF HP24A

[aston_jag_tech]

Need to rebuild the trans. Any advice on upgrades to hold with stand increased torque loads?

So far parts are looking around 300-350...

Thanks everyone.

-Scott

[shogun]

that is for an Audi, so better ask here
http://forums.audiworld.com/showthread.php?p=15243788

[aston_jag_tech]

Its the one for my car. :) Maybe I have the trans name wrong. :)

[shogun]

E34 535 has a ZF 4HP22, 4HP24 has a bigger bell housing to house the larger torque converter used on the E32 750.
In case of 4HP24 also the innards are enforced to some extend for the higher torque of the M70 engine, I remember a comment by Bill R. on this some years back on RF.
The housing is always stamped 4HP22, no matter if it is used on E30, E34, E32 etc., inside is different.

[shogun]

found it:

differences between 4HP22(used on 735 and other BMW like the E30 models) and 4HP24 (used on E32 750)

There are numerous changes in the 24 , first off

Springs with different rates are incorporated, next the torque converter diameter is increased to 280 mm then the bearing surface of the torque converter is longer to take the stronger loads, the converter lockup clutch diameter is increased to 300mm, the transmission bell housing is larger due to the increased converter size, the a tranfer plate is 15 mm wider in order to accept the larger a clutch, the stator wheel shaft is now mounted with 6 countersunk screws for a tighter connection with the transfer plate, a new pump body was designed for the longer converter shaft bearing, the splines on the input shaft are longer, both sealing rings on the input shaft are cast iron, the a clutch has a larger diameter and the clutch friction surfaces are increased in size also, the number of plates in the b,c and d clutches was increased by one in each,the one way clutch for 2nd gear has been stenghtened and riveted together, the oneway clutch for 3rd gear was changed from a roller type to a locking body type for greater torque, the planetary gear for 4 is much stronger now with forged webs, the output shaft diameter is increased and 2 holes are provided for more lubrication, the output flange has a larger bolt circle to take more force, the pan is deeper, the filter is different for the deeper pan.

Last but not least, remember that early E32 (maybe also E34) have trannies with 8 pins connector and the other ones with 7 pins. My 11/88 750 has 8 pins.
.

[ArnZ!]

mmmm 4hp24 sounds hot!

[aston_jag_tech]

Whoa, thanks!!!

That will add to my research! :)