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Old 04-25-2014, 07:18 PM   #1 (permalink)
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RSG 6 speed for 4x4 Trucks

Found this on google and there website said
"Rockland Standard Gear is making available a Tremec T56 6 speed transmission for 4 wheel drive pickup trucks.
These units will have transmission ratios of 2.97 1st, 2.06 2nd, 1.43 3rd, 1-1 4th, 0.80 5th, 0.62 6th, for great performance and gas saving highway use. All gear train is Corvette T56 with triple cone 1-2 synchronizers and double cone 3-4-5/6 synchronizers with carbon fiber synchro rings throughout.

These units will accept Chevy, Ford and Dodge transfer cases with 5 and 6 bolt flanges. Available with 27 or 32 spline out put shafts.

Measurements- 27.5" from back of block to back of rear adaptor (1/2") longer than GM or Dodge 3500 trans) 19" from back of block to shifter (2") longer than GM or Dodge 3500 trans."

When do these come out or has any one got one yet?
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Old 04-25-2014, 07:32 PM   #2 (permalink)
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Well the 2.97 is a joke ratio for first gear. way easier/cheaper to find a junkyard truck transmission.
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Old 04-25-2014, 08:06 PM   #3 (permalink)
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I m just looking in to it just to see if anyone is playing around with one. With 6th gear at .62 you could run something like 4.88 with 33s to off set the low first. Any thing over 5 speeds never really made to much sense to me. More gears equals more parts higher probability for failure. I ll never do it but if I won the lotto or made decent money I d mess around with one.
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Old 04-25-2014, 08:08 PM   #4 (permalink)
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Old 04-25-2014, 08:28 PM   #5 (permalink)
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wasn't there a hgtd burban tractor guy gunna do some 6 spd manual torque converter thingy here on Tuesday? bet he knows.
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Old 04-25-2014, 08:33 PM   #6 (permalink)
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NV5600 Gear Ratios:
RANGE RATIO
1ST 5.63
2ND 3.38
3RD 2.04
4TH 1.39
5TH 1.00
6TH 0.73
REVERSE 5.63

I'd rather adjust gear and tire size for the 0.73 sixth than the 2.97 first...
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Old 04-25-2014, 08:43 PM   #7 (permalink)
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The T56 is a garbage trans in the vette, why would anyone want to put it in a truck?!?

I have one tore apart at the shop right now with a busted reverse gear and 5th 6th synchro bad. Came out of a car with 27,000 miles
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Old 04-25-2014, 08:47 PM   #8 (permalink)
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I have a tow rig application where the NV5600/ZF-6 doesn't physically fit. I think the T56 would physically fit much better and the 32 spline Chevy output is sweet.

I would have to go from 4.10s to 4.88s to maintain my stock 0.75 OD. but that might be cheaper and easier than re-doing my entire floorpan to fit a ZF-6. Plus, gives me an excuse to do a front locker.

Towing, a six speed makes plenty of sense, 7-9 speeds would be better.
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Old 04-25-2014, 08:50 PM   #9 (permalink)
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for trail riding the lower first gear would be good, for ultra4 go fast i would think the 1st being numerically closer to second gear would be better.


also with low gears in the transfer case you dont really need the low first, i prefer the higher 1st gear ratio in my r151/r150 hybrid toy tranny vs my previous r151 tranny, going from 1st to second feels better.


im not an ultra4 racer though i just pretend to be one with a gutless 4banger so take it for what it is
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Old 04-25-2014, 08:53 PM   #10 (permalink)
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Towing, a six speed makes plenty of sense, 7-9 speeds would be better.
x2 i just swapped in an nv4500 into my 1st gen cummins a few months ago and im really wishing i would have spent the extra 1k$ and went with a nv5600, towing a heavy load up a steep grade going from second to 3rd and then 3rd to 4th sucks.
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Old 04-26-2014, 07:41 PM   #11 (permalink)
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That's my problem now. 4 spd auto with fairly tight spacing. I don't miss a low first (I have 4 lo if I need it) but the gaps are too big.
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Old 04-26-2014, 07:44 PM   #12 (permalink)
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im gonna turn the pump up a bit and put a 3200 gov spring in to help, but yea should have went 6spd
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Old 04-26-2014, 09:39 PM   #13 (permalink)
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Originally Posted by bottom_dweller View Post
wasn't there a hgtd burban tractor guy gunna do some 6 spd manual torque converter thingy here on Tuesday? bet he knows.
Did he really? What a chump

Last edited by 107096; 04-26-2014 at 09:39 PM.
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