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Old 06-13-2019, 04:21 AM   #1 (permalink)
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Need transmission advise - rock crawler

I am building a tube frame rock buggy, 4x4. I need a transmission recommendation. Here is what i have. It has 38 inch tires, 5.37? gears, power plant is a L33 alum block 5.3, stock bottom, 243 heads, valve spring upgrade, brian toolie stage2 cam, fitech fuel injection with vic jr intake. I think i want a manual shift t350 due to its light weight and efficiency. I would like to have the shift pattern p,r,n,123. Need to understand the dif between truck 4x4 trans vs car. Also...i have an old school heavy duty iron transfer case. Wondering about a 4x4 trans where the transfer case bolts right to the end of the trans?
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Old 06-13-2019, 04:27 AM   #2 (permalink)
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Need transmission advise - rock crawler

I assume your going to be using a computer to control the 5.3. Why not a 4L80E?
Edit: just read your using an aftermarket computer. Iím stupid

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Old 06-13-2019, 07:59 AM   #3 (permalink)
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What transfer case is it?

I'd skip the TH350 and look at a reverse manual TH400. Same gearing, way stronger.

Also, the old school transfer case with a TH350 or TH400 definitely does not make for good rock crawling gears. You'll probably want deeper t-case gears than that.
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Old 06-13-2019, 08:59 AM   #4 (permalink)
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My Jeep buggy is similar, (40s 5.38s) I run a TH400 behind a reasonably built SBC, through a stock ratio D300. Tranny has the TransGo 1-2 kit and a 2500 stall converter. Trans was rebuilt with all red frictions and kolene steels as well as heavier springs in the clutches. Only complaint I have is my TC is a bit high on the stall, as it flashes higher with how light the buggy ended up being, great for hill shooting but it’s under the converter in the slow technical stuff.
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