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R50 5spd trans gear ratios?


89D21Dude
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So I don't have a Pathfinder, but I have a transmission from one. From a 97 2wd, specifically. I swapped it in place of the old auto in my 88 Hardbody. 

 

I have a few questions about this transmission. One of which will have to wait until I can upload pics (sensor locations), and my other question is just what gearing does this 30A trans have compared to other 2WD 30A's. It seems my 5th gear is only slightly taller than 4th..  

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The '97 R50 FSM (free download from Nicoclub) shows these ratios:

 

1 3.580

2 2.077

3 1.360

4 1.000

5 0.881

Reverse 3.636

 

The '90 FSM (free download from cardiagn.com) lists different ratios in first and second for the 2WD and 4WD slushboxes. For 2WD (four-cylinder or V6):

 

1 2.785

2 1.545

3 1.000

4 0.694

Reverse 2.272

 

Looks like your overdrive with the manual is much less aggressive than the overdrive in the slushbox that you swapped out. This is likely why the 4WD trucks tend to have 4.3 ring and pinion gears with the manual, 4.6 with the auto.

 

What's your axle ratio? Should say on the tag in the engine bay, by the wiper motor. HG something.

 

The '97 trans will have a speed sensor rather than the speedo cable drive you need for the '88 (assuming you haven't done a round-dash swap). I assume you could fit the speedo cable drive from the old trans to the new one, though I have heard that they can be a bugger to remove. Be very careful with the gear on the end, sounds like they're not fun to track down replacements for.

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