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How long would a A4LD last if.....


Sevensecondsuv

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So I've still got the worthless POS 1990 ranger in the back yard. It has a broken 2.9L with a perfect shape A4LD with a HUGE tranny cooler on it (about 12"x24" Aluminum tube and fin). I know it's in great shape cause I took it out and had the front seal and torque converter replaced when I got the truck last winter. The guy who did the work said it looked great inside. Then the 2.9 took a crap 2000 miles later.

Anyways, I was trying to decide what engine I want to put in it. The idea of a low boost turbocharged 4.0 intrigues me. No more than 5-7 PSI. However, that should be good for near 300 ft-lbs of torque.

The truck has a 7.5" with 3.55 gears and 205/70R14 tires.

How long do you all think I could get the 2.9 spec A4LD to last behind such an engine? I'd keep the monster cooler and put a temp gauge on the tranny fluid to I could back off if it got too hot.

Or should I just save myself the trouble and put a M5OD in it with the new engine?
 
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Wicked_Sludge

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:icon_rofl::icon_rofl:

why would you even consider running such a weak trans and rear end behind a boosted engine. those units dont hold up behind the n/a engines that come in the trucks....they certainly wont be long for this world behind a turbocharged engine.

IMO, if the question is "when will it fail" rather than "will it fail", save yourself the hassle and replace them now.
 

Sevensecondsuv

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Yeah, but I kinda want an auto. I already have a 5-spd turbo ranger. It's going to be a junkyard build that doesn't need to be reliable. Heat is what kills autos and I definately have a good system for getting the heat out. Also it's not like there is going to be a huge torque differential across the clutch plates in the tranny - It's got an open 3.55 rear end with half bald 14" tires. Can you say "1 tire fire" ?!?!?!

More opinions please....
 
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Wicked_Sludge

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heat kills auto transmissions, but so does poor designing and inferior quality.

if you want an auto, go with a C5 or C4. they can be adapted without too much work and are much, MUCH stronger. they also have much better aftermarket support.

a shorter gear ratio (numerically lower) will INCREASE torque inside the tranmission, as well as putting a lot more responsability on the torque converter to get the process moving (heat). those tiny tires are your only saving grace.
 

Sunk

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This could be a stupid idea, but could you use a newer auto? Are they even compatible?

I've heard that the RBV autos have improved over time and aren't as bad.
 

Sevensecondsuv

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I just get depressed when thinking about having to swap trannies too. It may never happen if I have to do that much work.
 

Sevensecondsuv

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This could be a stupid idea, but could you use a newer auto? Are they even compatible?

I've heard that the RBV autos have improved over time and aren't as bad.
Newer auto's need a newer computer to run them. That's a huge pain in the rear wiring swap that I'd like to avoid...
 

exbass94

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DOOOOO IT!!! :clapping:
 

Sevensecondsuv

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All that can happen is it will break, right? That's all it's doing now, sitting there broken because of the stupid 2.9. It's going to be a junkyard build anyways.

The only thing that could happen is if I steal that tranny to put in my aunt's '93 3.0 ranger after swapping bellhousings. Otherwise I've got no use for it, so I may as well break it.
 

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