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Turbo & 3.90 5spd D/R Q's
Posted 02 October 2003 - 02:25 PM
1) Anybody, besides myself, running 3.90 5spd D/R in a turbo?
Moved from an RX tranny to improve torque, results have been amazing, except I have to walk into 2nd gear because syncros can't handle 10psi boost:headbang:
2) Along the same lines, has anyone put 3.90 gears into a full time tranny?
FWD is cool, good milage and massive torque steering, but running 4WD on dry pavement with a locked center diff on the ol' 3.90 D/R, grenades more axles than it's worth...
3) lifted turbo's, what ratio of tire size&width to axle breakage have people experienced? I.E. at what point does too much traction cause excessive axle damage.
Posted 02 October 2003 - 03:17 PM
anyway, the automatic wouldnt let the tires break free in mud, let alone shift right.....
the 3.9 gear is a lot more fun than a 3.7--i got a 5spd single range in my gl-10, and it didnt want to pull in the sloppies.
i had a 5 inch lift on the ea81, didnt affect the axles, the ea81 turbo automatic uses the same axle as the regular trannies.
when you lift a soob, the axles will be in the same alignment relative to the suspension, because its all a body lift.
if your car is already turbo, being it had(has) an rx tranny, or a single range 5spd, it will already have the s27(or 29? turbos have more)plines for the turbo axles.
if you are going to use a regular 5spd dual range, you will need to find the non turbo axles, or swap DOJ with the 25 spline
i know of board members who have swapped 3.90 gears into 3.70 gear LSD, and the rx 5spd is not much different than a normal 5spd, and i would suppose that the gears would swap into a an rx tranny without fitment issues!
for the tire question: I have a 5spd dual range with a n/a ea82 motor in my 83 wagon, had a set of 16 inch chevy rims drilled out with 205/55 tires, i broke the inner doj turning from a stop while getting on it, but that is because the boot had been gone for some time, the axle coming from a parts 88 wagon
Posted 02 October 2003 - 05:35 PM
I just picked up a steel work bench today and how have a place to mount my vises (one at each end) (man, that sounds a little kinky). Anyway, now I can do the 3.90 LSD conversions a lot easier.
Posted 02 October 2003 - 06:26 PM
since we are the topic. I got an EA81T, 5spd D/R w/ ctr locker, and a 3.7 all waiting on the bench for motivation & answers.
is the 3.9 quicker/better than the 3.7? why?
is the 5 spd D/R w/ ctr lock more trouble (reliable?) than the effort?
I ask because I live in San Francisco, and gas is brutal and I got 4wd D/R if I need extra traction................everything is paved anyway. Would the current 4wd system be enough for rallyX since i'ts on dirt/grass anyway??? plus easy to find when blown..
trying to figure out if I should complete my RX-ification or
BTW- the KYB, sway bars, vented frt disc & rear disc conversion was worth it, so were the touring wagon seats:headbang:
82 GLW Snow White
Posted 02 October 2003 - 08:52 PM
Posted 02 October 2003 - 09:39 PM
hey RallyRuss:wave: ...anyone
ha ha ha
Posted 02 October 2003 - 11:58 PM
Posted 03 October 2003 - 11:15 AM
should I too consider converting the system to 3.9 instead of 3.7 before install? big difference?
what's the scope of the conversion?
quickness/torqueniess is very appealing for my rally X aspirations..........
what type of top end sacrifice will I be making.....?
bla bla bla
82 GLW (losta mods)
Posted 03 October 2003 - 01:41 PM
I can get second gear tire churp from my sedan on dry pavement, don't know about a RX.
Posted 03 October 2003 - 02:03 PM
I have an extra of each and will do this when time and space allow. This was the impetus for the following thread I started a few weeks ago.
I wanted to know, with stock tires, what the difference will be between the gearing in the real world. I have done some of the math but the real world is always better.
'89 TTW, FT4wd D/R Diff lock, rear LSD, 5 little lugs w/ Outback rims.
Posted 03 October 2003 - 06:03 PM
The rear shafts seem to be strong enough, but it's the stubs out of the rear dif that worrie me. I have yet to break one, but after seeing the "Subarubicon Gold" tape, I know that it's just a matter of time. But that's me, if YOU drive it eazy and don't "pull a Tony!" on big obsticals on the trail, I bet it would survive just fine.
WELDED DIFS FOR ALL!!
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