does an M1 zf have a longer input shaft?

[Jack]

Does an M1 zf have a longer input shaft? If so please tell me what you have done to correct this.

[Rick Muck- Mark IV]

To my knowledge, yes. When Safir P1116 was asembled the input shaft bottomed on the crank recess and wped out the thrust bearings in short order. I think the extra length is only .20/.25 but enough to cause a problem. Solution was to machine the end of the input shaft and re-machine the tapered end.

[Frank Catt]

Jack, I have used a ZF/M1 Box in a gt40 and have records of the dims in my records ( somewhere ! ) if I can find them I will pass on to you, Frank

[Jack]

Thanks to you both, I am waiting on my McLeod clutch to show up and then I am ready to put the package together, I have already changed the shift rod and added the knuckle joint and box for the shifter. My best friend said he had read there was a difference but I can't seem to master the search engine on this site.

Here is a picture of it bolted to the block to align everything up. What bearing are you using for the shaft? Whats your opinion on the gearing of the M1?

[Jack]

forgot one picture

[Chris Melia]

Hi Jack

The length of your input shaft depends on the depth of your bellhousing, the pilot bearing is 12mm and will probably need a carrier machining
regards

Chris.

The drawing below is dimensioned for a 4" bellhousing

[Bob Putnam]

According to my records, the M1 input shaft protrudes 4.54" proud of the bellhousing mounting surface. That's actually about 3/8" shorter than the Pantera DS2.