GTUs diff on s5 NA tranny
#1
'89 GTUs
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GTUs diff on s5 NA tranny
Well I have a GTUs thats in horrible mechanical condition. Suffice it to say, it needs a lot of new EVERYTHING. Anywho, I also have an S5 GXL. The frame is bent on the GXL so im most likely going to swap the engine and a lot of other parts into the GTUs, basically mix and matching to bring the GTUs back to almost stock condition. The tranny on the GTUs has bad syncros in 5th gear, but other than that it shifts pretty well. I dont know how much it would cost to get it rebuilt, and I wont have the money for it right away, so I will use the tranny from the GXL. Heres the question. What will be the differences between using the GXL tranny and the GTUs tranny with the 4.3 diff? I know the GTUs tranny is geared a little differently to compensate for the 4.3 diff, and the rate of speed differs on the tach compared to the regular NA tranny. Will using the GXL tranny make the car slower than using the GTUs tranny?
#2
Rotary Enthusiast
Originally Posted by Omixeo
Well I have a GTUs thats in horrible mechanical condition. Suffice it to say, it needs a lot of new EVERYTHING. Anywho, I also have an S5 GXL. The frame is bent on the GXL so im most likely going to swap the engine and a lot of other parts into the GTUs, basically mix and matching to bring the GTUs back to almost stock condition. The tranny on the GTUs has bad syncros in 5th gear, but other than that it shifts pretty well. I dont know how much it would cost to get it rebuilt, and I wont have the money for it right away, so I will use the tranny from the GXL. Heres the question. What will be the differences between using the GXL tranny and the GTUs tranny with the 4.3 diff? I know the GTUs tranny is geared a little differently to compensate for the 4.3 diff, and the rate of speed differs on the tach compared to the regular NA tranny. Will using the GXL tranny make the car slower than using the GTUs tranny?
Hot_Dog
90 RX7 GXL
#4
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Originally Posted by SonicRaT
The tranny is identical, gears and all. There's a couple of fubbed places that published the TII gear incorrectly.
Hot_Dog
90 RX7 GXL
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The 5th gear is the same between the NA and the GTUs tranny, some places fubbed and put the TII 5th gear on the GTUs when really it's the same. Take them apart and they're identical.
#6
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Originally Posted by SonicRaT
The 5th gear is the same between the NA and the GTUs tranny, some places fubbed and put the TII 5th gear on the GTUs when really it's the same. Take them apart and they're identical.
Gear, counter
M507-17-308 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M508-17-308 (w/o turbo, hard susp) --> GTUs
Gear, over top
M512-17-611 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M514-17-308 (w/o turbo, hard susp) -- GTUs
I've bought these gear sets before, so I'm well aware of the differences.
Hot_Dog
90 RX7 GXL
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And every set I've ever ordered has always been the same. I was kind of upset when I got my set from MT and apparently they've been that way for as long as they could remember. I've pulled apart 3 GTUs trannies in the past year of which all were the same as the standard NA counterpart. I did speak to Mazda about this before, and they suggested that they probably no longer make the GTUs set and ship standard sets instead.
Hard to say, but I'm positive at least the one tranny was 100% original to the car and never rebuilt.
Hard to say, but I'm positive at least the one tranny was 100% original to the car and never rebuilt.
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#9
Tear you apart
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Originally Posted by Hot_Dog
I've rebuilt both S5 GXL and GTUs transmissions -- The 5th gear sets are different. If you look at the Mazda parts listing, than you'll see that there are different p/n's for these 5th gear sets.
Gear, counter
M507-17-308 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M508-17-308 (w/o turbo, hard susp) --> GTUs
Gear, over top
M512-17-611 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M514-17-308 (w/o turbo, hard susp) -- GTUs
I've bought these gear sets before, so I'm well aware of the differences.
Hot_Dog
90 RX7 GXL
Gear, counter
M507-17-308 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M508-17-308 (w/o turbo, hard susp) --> GTUs
Gear, over top
M512-17-611 (w/o turbo, nor. susp) --> S5 NA excluding GTUs
M514-17-308 (w/o turbo, hard susp) -- GTUs
I've bought these gear sets before, so I'm well aware of the differences.
Hot_Dog
90 RX7 GXL
I just looked them up in my NAPA catalog (where I buy my rebuild parts) and I can say that Hot Dog is correct.
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