999 Lock-Up Transmission / change input shaft to non LU?

[360duster]

Hi Guys,

i found a early 80´s A999 Transmission from a Van for sale, # 4058398. Would like to get it to rebuild it. My concern is if it´s a Lock-up unit, could the Input shaft and if necessary the pump gears be changed to non LU-Parts? Still waiting for pics of the Input shaft to identify it exactly. Just curious.....Thanks for Info!

Michael

 

[Locomotion]

There may be more difference in the pump area and I believe the valve body needs to be changed. Converters do not interchange. The lock-up transmissions have about a 3/4" smooth tip on the input shaft where the regular ones have splines all the way to the tip.

 

[360duster]

yes, of course the VB is different if it´s a LU trans. VB is easily changed, i see more Problems in the pump / Input shaft area.

 

[rmchrgr]

My concern is if it´s a Lock-up unit, could the Input shaft and if necessary the pump gears be changed to non LU-Parts?

Nope, not without a huge hassle. Tracking down all the correct parts, including the pump and non-lockup drum that fits that particular pump is essentially impossible to do here in the US, can't fathom trying to do that in Germany!

You actually posted a reply in my old thread here, might help to go back and look through it.

How to identify a non lockup A999 transmission with pics!

 

[360duster]

Ok, thanks for the clarification.

i remembered your old thread, was pretty interesting. I did a full rebuild to the trans i mentioned then, now nicely working in my 408 Valiant. And you were right.....it was no 999, but equipped with 4pinion steel planetaries - i think it was a 998.

This one i´m talking about now is up for sale, i always check the market and try to collect "the good stuff".

Thanks all!

 

[Duane]

Hi Guys,

i found a early 80´s A999 Transmission from a Van for sale, # 4058398. Would like to get it to rebuild it. My concern is if it´s a Lock-up unit, could the Input shaft and if necessary the pump gears be changed to non LU-Parts? Still waiting for pics of the Input shaft to identify it exactly. Just curious.....Thanks for Info!

Michael

I have done this. I did it by finding a non lockup slant six trans to use the pump and the input shaft. The sealing ring diameter of the two trannies is different by like .060. Hard to notice with naked eye.
Best to get the correct direct drum to match the new slant six pump.
It can be done with some work. You can get the correct drum at a&have trans. They have a listing for it. Or try Wittrans. Whatever it takes transmission. Great prices there. If you use 5 clutch. Parts from the 1980s tranny you will have to have the stator bore on the slant six pump opened up. Again A&a sells that part already machined.
Those 1980,s 904 were the strongest ones.
You must change valve body as mentioned.
Good luck.

 

[Dazedandconfused]

Okay so I'm contemplating doing this to my 998. I rebuilt it and it works great but we have a few 904 converters I would like to try. I have a v8 904 with a bad case I can rob parts from. I would need the drum, input shaft, pump out of the 904 correct? It would be nice to do this over the winter. I already have a full manual non lockup valve body in this transmission

 

[oldkimmer]

If u have that spare just take everything from in front of the out put shaft. U can do this if it is very close in years. Measure everything to be sure. Kim

 

[rmchrgr]

I have a v8 904 with a bad case I can rob parts from. I would need the drum, input shaft, pump out of the 904 correct?

Unless your 998 is non-lockup, (not likely) that is incorrect. Lockup parts DO NOT interchange with the non-lockup parts. You can convert a lockup unit to a basic non-lockup the way you suggest but the large, 5 clutch drums from the 999 won't fit without the right input shaft and pump. They may look close but there are slight differences that won't allow a straight swap.

How to identify a 999 transmision.

Everything you never wanted to know about 904s