I'm suppose I'm deranged but.....

Kspen90

<<<got turbos?
Jul 14, 2011
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Burleson, Tx
go as fast as you can in 4 lo and try to shift into 4 hi, tell me what happens :D

Agreed in an automatic it would most likely be catastrophic, but being a zf-6 I'm hoping for a different result :eek: Looks like its time to search the local dealerships and see if I can't find one to test it out on :roflmao:
 

Porno Joe

Member
Oct 11, 2010
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Agreed in an automatic it would most likely be catastrophic, but being a zf-6 I'm hoping for a different result :eek: Looks like its time to search the local dealerships and see if I can't find one to test it out on :roflmao:


you can't shift into 4 lo with the truck moving, zf-6 or not, you push the clutch in @ 70 mph, your driveshafts are still spinning, your t case is still spinning.
non synro'd t case + attempt to shift at 70= disaster

edited to add: some of the old "two speed rear-end" trucks werent actually changed at the rear end. My dad had one a long time ago, I think it was like a 70 or 72 gmc 6500, and it was a 4 speed, with a "2 speed rear" but it was actually a gear reduction box mounted to the back of the trans.

Dunno if you could find something like that.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,694
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Phoenix Az
Agreed in an automatic it would most likely be catastrophic, but being a zf-6 I'm hoping for a different result :eek: Looks like its time to search the local dealerships and see if I can't find one to test it out on :roflmao:

doesnt matter if its a auto or not. my samurai is stick and you can not shift the t-case from low to high or visa versa without grinding the cogs. This is why manual transmissions have syncros. without them you would grind just like you do the t-case.
 

JoshH

Daggum farm truck
Staff member
Vendor/Sponsor
Feb 14, 2007
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You wouldn't want to use the low range reduction from a stock T-case anyway. It would be way too much overdrive. You'd be looking along the lines of .37:1 gear ratio.
 

KEVINL

Well-known member
Jul 4, 2008
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Phoenix, AZ
You just need to figure out how to rev match it to keep it from blowing up :roflmao:

I agree even a 2:1 t case would be way too high
 

zf>allison

you never had your car.
Apr 30, 2013
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elsberry mo
if your gonna go through all that, why not slap a four or five speed behind your t case, and have all the damn gears you want, they did it in old grain trucks an aux trans.