Thread: RRC Transmission and Transfer into a D1

before you do try this...

stop the vehicle on a slight hill with just the foot brake
select neutral on the tcase
put the auto in park
attempt to select high on the Tcase, (maintain effort on the range selector for the next few steps)
release the foot brake
select drive on the auto
gently accelerate
brake
(release the range selector)
continue driving.

IF that works for you then you have 2 potential things happening

1. the dogs in the tcase are on the way out, its not fatal yet but its now worth the effort to start planning an overhaul.
2. the auto is maintaining drive even in neutral.

Thanks Dave I'll give it a try. I did try it in both neutral and park. I'll have a bit more of a play.

On the other note, is the transfer case from an 87 RRC compatable for a swap if needed.

The Auto box in the 87 is likely coupled to a Borg Warner viscous coupling transfer case which are O.K. but not as good as the LT230 in th D1

yeah, what she said.

you could do it, but why would ya?

RR went viscos in 89 , an 87 should have a lt230

1. the dogs in the tcase are on the way out, its not fatal yet but its now worth the effort to start planning an overhaul.


I was having a thinks about it on the drive home from work. If the transfer case is a dog clutch type setup the idea speed would need to be low for the gears to mesh. At times when I go back to neutral the ideal sits a bit high, around 1200 and take a while to settle if at all. Some time a jab of the accelerator help. (yes I have cleaned the valve at the end of the Plenium). Fine in drive so put up with it.

If the ideal is up a bit high could this be stopping the dogs engaging. I will have to see if this coincides with the times it wont engage.

AFAIK, all autos retain a bit of drive in neutral and if you have a high idle this will be exacerbated.
In my 92 RRC, I initially had to stop the engine sometimes to put into low range as the car had never been into low range before I bought it and everthing seemed sticky.
So yes this could cause difficuly with selecting low range. Try stopping the engine, into low range then restart.

I do know that mine has a BW so is different, but the issue seems to be hydraulic drag in the auto causing load on the input gear of the transmission.
Regards Philip A