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Discussion Starter #1
Is anyone running a Turbo 350 transmission and dual T-Cases? I'm considering using a Turbo 350 when I install a V6 in my 85PU due to its increased strength over the stock G52 and cheaper installation costs.

Admittedly, I don’t know much about autos and the effect of low gears (4:88 x 2.28 x 2.28) on the torque converter. Would such a combo work o.k. with each other?

TIA
 

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I run a 700R4 with dual 2.28s and find it works great for rock crawling.
With an auto I do suggest you do a dual 2.28 and not a single 4.7:1.
With the auto you have to shift thru all the gears everytime you stop.
Retaining the single low is nice when you don't need the super low
gearing.
Jay
 

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Jay, I am REALLY interested about hwo the auto works... I am planning dual cases with a TH350 behind a 4.3L and being a life long manual tranny for off road user, I am leary of the change...

Please do what you can to alieviate my fears <IMG SRC="smilies/frown.gif" border="0">
 

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I'll raise the question pot with a "Is a body lift necessary make room in the trany tunnel for either the Turbo 350 or 700R4?".

TIA

SPR
 

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I've had no problems with my auto overheating. Mine is built with a shift kit (would probably not use again) and has about 87k miles and 10 years use on it. I run the AA radiator with cooler tank and the smallest size aftermarket cooler as well.

I really like the auto for wheeling but really prefer a stick on the street. Compression braking used to be poor before my crawler setup, but seems good now.

I run a B&M Megashifter. I chose it at the time because it was the shortest shifter I could find and I wanted it to fit just under the edge of the dash. I still had to recess it 3/4" into the floor to get it to fit.

I too wasn't sure about running a juice box on the trail. But that's ten years past and I now have confidence in a well built tranny.
Jay
 

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I've had a 231 V6/TH350 setup for 15 years or so, and am currently rebuilding the truck due to extensive rust. Here's my observations, FWIW.

Over heating: somtimes on 95*+ days, even with a custom 3 row 2" longer radiator. This is being replaced during the rebuild with an even larger one.

Body lift: Necessary no, but the extra room is nice for both V6 and trans. My truck had a 2" BL before the swap.

Shifter: Originally from an old Chevette (cause it was free), now a B&M (cause it was free too)

Broderick

231 V6/Holley 4bbl/Weiand intake/Downey headers // TH-350 L/U with 700R4 1st & 2nd gears
 

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I have a 82 toy with Buick 231 on TH350 with Marlins ultimate dual case
Diff gears are 410's running 36 TSl's
My crawl ratio is about 111:1 which works GREAT!! Freeway speed is 75-80 @ 3k rpm
Engine can get 220 on hot day's but I added a 10" elect fan.
Trans can heat up to 200
Problems with trans , if you don't support it well and protect it from getting hit it will crack at the back end.
Other than that I'm happy <IMG SRC="smilies/biggrin.gif" border="0">
350's are very strong,reliable and simple

[ 09-06-2001: Message edited by: Toyotaboy ]
 

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Originally posted by Toyotaboy:
[QB]I have a 82 toy with Buick 231 on TH350 with Marlins ultimate dual case
Diff gears are 410's running 36 TSl's
QB]
36" tires w/4.10 gearing? How do you get away with that? I think my 33's are too tall for the stock 4.10's, and was thinking about 4.88's or better.
 

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Discussion Starter #10
Guy -- Thanks for the comments <IMG SRC="smilies/biggrin.gif" border="0"> .

SPR
 

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Originally posted by fourwd1:
<STRONG>36" tires w/4.10 gearing? How do you get away with that? I think my 33's are too tall for the stock 4.10's, and was thinking about 4.88's or better.</STRONG>

I run 38's with stock gearing and am quite happy on the street. It's a power thing, if you up the power, you don't necessarily need to lower the gearing to compensate for larger tires. As sson as the stock motor goes away, so does the tire & gearing chart. Of course once this truck becomes a pure trail-only rig (when I get a tow rig), the gearing will go down. As long as I need to get to the trails with it, I don't want to overrev my engine with low gears.

[ 09-06-2001: Message edited by: toy283 ]
 

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I'm thinking 4.3L V6 + TH350 + Toyota Dual cases + 4.10 gears + 38.5"/39.5" tires...

How does this sound?
 

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Discussion Starter #13
With dual T-cases, it seems to me that the placement of the trany shifter would be too far forward or too far rearward. Jay mentioned that his sits somewhat tucked up under the dash - I hope I read that right. Downey offers several different T350 adapters. It appears that their 3" and 6" adapter will accommodate at bench seat style T-case shifter - the kind that has the shift rails extending into the rear of the trany housing. It may be possible to have the foward T-case shifter sit right above the T-case - like on bucket seat trucks. But would this set the two T-case shifts too close together - causing the shifter nobs to hit when in two wheel drive?

spr
 

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Wouldn't the cable linkage with the auto trans let you move the shifter forward or back?
 

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Originally posted by JackA:
<STRONG>Wouldn't the cable linkage with the auto trans let you move the shifter forward or back?</STRONG>
Yes, that's one of the reasons I switched to the B&M, it's a cable type. The Chevette shifter I was using was a linkage type I modified.
 

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Originally posted by DeeAreEmm:
<STRONG>I'm thinking 4.3L V6 + TH350 + Toyota Dual cases + 4.10 gears + 38.5"/39.5" tires...How does this sound?</STRONG>
Is that with Toy axles or beefy ones swapped in? 38-39" tires seems too big for both the axles and the 4.10 ratio. I had 33's and even with the V6 HP I noticed a power loss, and at highway speeds the MPG suffers. The engine runs out of it's power band. It's something I just had to deal with, but now I'm putting in a 350 lock-up to help on the highway (even though this is mostly an ORV now). The lower 1st and 2nd gears from a 700R4 will help on and off road.

As far as a auto tranny offroad, I like it, especially when I have to stop midway up a steep hill.

As always, YMMV.

Broderick
 

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Originally posted by fourwd1:
<STRONG>Is that with Toy axles or beefy ones swapped in? </STRONG>
44 front/60 rear <IMG SRC="smilies/glasses.gif" border="0">

And this is NOT for on road use - the only pavement it will see is between the trailer and the trail head <IMG SRC="smilies/biggrin.gif" border="0">
 

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What are the gear ratios for the T350 and 700R4? Also, on another thread, a guy mentioned running a T400 torque converter with the T350 for lower RPM grunt and better fuel economy - What's that all about?

spr
 

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Originally posted by StevePR:
<STRONG>What are the gear ratios for the T350 and 700R4? Also, on another thread, a guy mentioned running a T400 torque converter with the T350 for lower RPM grunt and better fuel economy - What's that all about?

spr</STRONG>
TRANS 350 700
1st 2.48 2.75
2nd 1.48 1.57

Don't know about the converter Q, but can find out. I do know that for any trans there are many variations of converters available to match to a specific application.

Broderick

[ 09-07-2001: Message edited by: fourwd1 ]
 

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Discussion Starter #20
Thanks for the info. Broderick. I need to find a "Auto Transmissions for Dummies" guide. It seems there are so many variables to putting together the right trany.

spr
 
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