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Old 07-19-2005, 01:24 PM   #1 (permalink)
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Auto Transmission Tech???

How many of you trail guys running a reverse manual valvebody in your auto? I have a Coan RMVB for my TH350, but have considered not installing it for this build. I really do not see an advantage to having one for a trail rig unless you can tell me why. Lets hear your thoughts on these for a trail/sometimes street driven rig.
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Old 07-19-2005, 01:35 PM   #2 (permalink)
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Do you get compression braking with that valve body?
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Old 07-19-2005, 01:42 PM   #3 (permalink)
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I'll have to check - bought it reman on Ebay. As far as I know, the Coan website does not mention a valvebody with compression braking.
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Old 07-19-2005, 01:55 PM   #4 (permalink)
 
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I ran a Turbo Action Cheetah in my old K5 (TH350) and some of the things I liked were full line pressure at all times so no slippage of the clutches, the trans will not shift into 2nd at any point if in 1st gear, and it does away with the kickdown cable and regulator. I ran the cheap Z-gate shifter and I did not like it at all. Mine was not a reverse valve body so going from 1st to reverse was a pain but that was the shifter.

The trans was built with extra clutch packs so street driving was interesting. Going from 1st to 2nd was very powerful and would induce whiplash on children and people over 65 years old. Anything over 3000 RPM would cause the 38" TSL's to bark 1-2 or 2-3. On the rocks and trails it performed well with no issues.

I liked having the manual valve body and plan on using it on my next trail rig.
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Old 07-19-2005, 02:46 PM   #5 (permalink)
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I have one- Art Carr reverse pattern valve manual valve body with full compression braking in all gears.

It's just like driving a manual, except there is no clutch to worry about.

I also use the Art Carr gate shifter and the reverse pattern makes is a quick shift between first and reverse- very handy if trying to climb something and you need to make a fast gear change to reverse to avoid an endo.

Also, manual valve bodies that offer compression braking apply the low/reverse clutch when you engage low gear- this helps to prevent the reaction sprag that would normally be responsible for 'holding' first gear from getting ripped from the case. It is definitely a wise choice for severe abuse.
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Old 07-19-2005, 03:02 PM   #6 (permalink)
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Reverse manual will also put first gear right next to neutral.. and only 2 clicks away from reverse. If you need to know why that is need for wheelin.. you've never played on vertical stuff.
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Old 07-19-2005, 09:45 PM   #7 (permalink)
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Quote:
Originally Posted by Vermin
Reverse manual will also put first gear right next to neutral.. and only 2 clicks away from reverse. If you need to know why that is need for wheelin.. you've never played on vertical stuff.
Will it work good for muddin?

I meant, without pointing out the obvious. Actually, I was concerned with wheeling where you have some distance between the tough stuff. Alot of times now, I find myself shifting into drive for these drive betweens - being lazy. I don't mind shifting manually, but just checking to see if there are any drawbacks, like leaving it in 3rd after slowing. I guess this eliminates others driving my truck without a watchful eye.

Last edited by MudzerK5; 07-19-2005 at 09:52 PM.
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