GT40s.com - View Single Post - Inversion ZF 5DS-25/1 transaxle and bell housing

Ross Nicol · 12-13-04, 11:52 PM

Yes I agree with Pat.The ERA manual has a lot of helpful info on ZF inversion and clutch/flywheel/starter as well.ERA sell a bellhousing for /2 which incidentally is 7 bolt and has a flat bottom to allow low engine/drivetrain positioning in chassis.I reckon you should also obtain the ZF workshop manual if you plan on doing any internal work yourself.See my post on this forum (18 months with a ZF)if you need encouragement.I have a BMW M1 ZF which I am lead to believe is a /2 with a stronger case and already inverted for GT40 use.There is a lot of ZF info on the pantera forum and you'll find gear ratios listed for /1 and /2 models.The /1 had a .86 fifth gear( not so good for touring) and /2 had .705 fifth and 4.22 diff ratio(also not great for touring)so a lot of pantera owners have changed crown wheel and pinion to 3.77:1 (much better for touring on the road.Good luck and a very good Idea to plan like you are doing.I did a lot of planning on the ZF as a large part of the build revolves around it.And even after the car was finished I still had to alter the internals to suit my use for the car which is on the track.
Ross

12-13-04, 11:52 PM	#8 (permalink)
Ross Nicol ross nicol 10 tenths Join Date: Dec 2002 Location: melbourne austr Posts: 1,062 Rep Power: 20	Re: Inversion ZF 5DS-25/1 transaxle and bell housing Yes I agree with Pat.The ERA manual has a lot of helpful info on ZF inversion and clutch/flywheel/starter as well.ERA sell a bellhousing for /2 which incidentally is 7 bolt and has a flat bottom to allow low engine/drivetrain positioning in chassis.I reckon you should also obtain the ZF workshop manual if you plan on doing any internal work yourself.See my post on this forum (18 months with a ZF)if you need encouragement.I have a BMW M1 ZF which I am lead to believe is a /2 with a stronger case and already inverted for GT40 use.There is a lot of ZF info on the pantera forum and you'll find gear ratios listed for /1 and /2 models.The /1 had a .86 fifth gear( not so good for touring) and /2 had .705 fifth and 4.22 diff ratio(also not great for touring)so a lot of pantera owners have changed crown wheel and pinion to 3.77:1 (much better for touring on the road.Good luck and a very good Idea to plan like you are doing.I did a lot of planning on the ZF as a large part of the build revolves around it.And even after the car was finished I still had to alter the internals to suit my use for the car which is on the track. Ross