Ls2 cruiser

I am trying to put a 4L80E rear shaft into a TH400 rear carrier and adapt it to a landcruiser transfer case. I need to use a 4L80E rear shaft as the TH400 shaft is not suitable as it is longer and when cut shorter it would have no splines left. Will the 4L80e rear shaft fit The TH400 carrier? Advance adaptors only have a 27 spline shaft set up for the TH400 adaption and I want to keep the 32 spline like the 4L80E adaption. Thanks Russ

Vince B

iTrader: (1)

I guess it could be done providing you have the correct extension adapter. You would have to look at all of this to see. I have not done this so I can not say for sure if it would work.

You will need to get an early 80 shaft for lube purposes. One other thing that comes to mind. How are you shifting your th400? The reason I ask is if you are using a govenor then you will have an issue using an 80 shaft. I say this because there are not splines on the 80 shaft to drive the govenor gear. Hope this helps some. Vince

Ls2 cruiser

VinceB, the Th400 will be reverse manual valve body so shifting is ok. As long as the big circle of teeth fit into the planetary gears we should be ok. The little bush inside the front and the bigger rear bush have the same part numbers for both shafts. The adaptor covers the rear shaft and is only 3.19 " long. The 4L80E shaft has to be cut back to 1.6 " protruding from the rear housing. I dont know about the lube of the shaft. How does that work and how does the early 80 shaft help? Cheers Russell

Jake's Performance

iTrader: (2)

4L80E output will fit into the rear carrier and will fit into the TH400 rear bushing.

You need to check the lube and be sure it gets to the case bushing. The 4L80E has pressure fed lube to the rear bushing, where the TH400 relies on "run-off".

Otherwise it work as Vince has already covered.

Ls2 cruiser

As well we may have to use the 80e adaptor so my next question is will the 80e adaptor fit the TH400 rear box without the rear housing of course. I think the TH400 has different size bolts maybe AF instead of metric like the 80e. They both have 6 bolts for the rear housing but is the size and shape of where the housing goes on the same? We dont have many 80e boxes in Aus to do a comparison here or 80e shafts for that matter. I will have to purchase a 80E rear shaft from somewhere in the US. I can get the adaptor from Advance Adaptors. Any idea of where to purchase just a shaft?

Jake's Performance

iTrader: (2)

The 400 and 80 use the same bolt pattern, there is a slight difference in the register.I think the 400 uses a larger diameter register. Might be a problem using the 80 adapter.

Ls2 cruiser

Thank you, what is the register?

Vince B

iTrader: (1)

Jake is referring to the step on the tail housing that is indexing it to the case.

Ls2 cruiser

Vince, I spoke to my transmission fellow today and the difference in the rear shaft of the early 80e must be the oil hole where the bigger bronze bush runs. Are we on the right track there? Are the early shafts common as I will have to buy one from the US. We could possibly drill a hole in a later model shaft I suppose to let the oil feed through. The difference in the adaptor register or step we will have to modify. Thanks for all your help Cheers Russ

Ls2 cruiser

VinceB, It turns out we actually need a 4x4 80E output shaft. Does the shaft lubricate the bush same as the TH400 or is it pressure fed and what is the difference with the actual shaft as far as the oiling goes? Thanks Russ