| Author |
Message |
    
David Woo
| | Posted on Saturday, April 20, 2002 - 01:10 am: | 
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Anyone have any experience with the Ashcroft high ratio transfer case? I am thinking about it and wondered if anyone has installed one and how does it perform?
Thanks, David Woo |
Ron
| | Posted on Saturday, April 20, 2002 - 01:46 am: |
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Couple of the locals just completed it.
Here is my major beef:
It will not work on a SI, SII, or very early SIIa T-case with the lower low range without swapping the low range for the later IIa/SIII style.
If you can get by that, and don't mind the big jump in gearing it is a good set up.
I have an OD that is on my list of things to rebuild. I already switched to a crank driven Koenig to accomidate it.
Rockymountain is making new overdrives and RDS has had rebuilt ODs on sale for 800 w/o exchange so there are other options but I do not feel that they are as strong as the ashcroft mod.
Ron |
Tom P.
| | Posted on Monday, April 22, 2002 - 04:16 pm: |
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Ron,
Did you ever drive either of the Ashcroft converted LR's? I'm wondering what 1st from a dead stop is like? The Ashcroft would be nice at 55+mph, but I worry about the take-off ratio.
How do I find out my t-case ratio? Is a function of year produced? Or sufix on the box?
Tom P. |
Ron
| | Posted on Monday, April 22, 2002 - 08:04 pm: |
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Yours will be the higher ratio. I think the crossover is 63ish. Yes it is suffix based but I don't know off the top of my head.
I did not drive either (Tom B offered but I am too tall to use the clutch in his SI and the other is the previous owner of your truck).
Tom seemed pleased. I belive he has the later tranny and t-case though. Keep in mind that the tranny gearing changed along with the t-case. The earlier boxes have a less steep first gear so performance would be worse on one of those than on yours. Personally I don't think the issue is first I think it is maintaining speed in forth/third but with as fresh of an engine as yours I think you would be ok.
Ron |
LR Max
| | Posted on Tuesday, April 23, 2002 - 06:03 pm: |
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I suspect that the Ashcroft ratio upgrade is similar to the overdrive ratio. If that is so, it ain't all that great at low speeds.
When I was bringing my rover home (Charlotte, N.C.) from Tennessee, I drove over the mountains and at one point, I left the overdrive on (oops!!!). I noticed the truck didn't want to go up the hills as much, and it just didn't want to go from a dead stop. If I were you, go for the overdrive.
Besides, the kids at school can't believe how many levers there are comming out of the floorboard!!
Max T.
Series 3 109" "Ralf" |
John Parsons
| | Posted on Wednesday, April 24, 2002 - 03:51 pm: |
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I ran the Ashcroft in a 1960 SII 88 with a 2.25 diesel in British Columbia. This was a daily driver and I also put on many highway miles. On the whole I was very happy with it as compared to the OD which it replaced. There were some issues though
- initially put it behind the original gearbox and ended up breaking the layshaft (right at first gear I think). Did this twice and decided that the extra torque required to get it rolling, even though there was no real clutch slippage was too much for this small shaft.
- Built up a SIII "D" suffix box to beat this problem, which it did.
- First was not really a problem except on all but the steepest hills which required a low range start.
The current owner is running 33's (I had 7.50x16's) and found the first gear to be too tall (no doubt!!) so he has gone to an "A" suffix SIII box for the lower first.
Hope this info helps you decide.
Regards
John |
David Woo
| | Posted on Thursday, April 25, 2002 - 11:15 pm: |
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Thanks for all the responses: I have a newish Turner HO in my 1967 88 inch, so there is enough power to push the higher gears. The hrtc would be a nice way to lower the revs and make freeway trips a little easier on the HO, and my ears.
Thanks again, David Woo |
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