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Old 10-07-2005, 06:26 PM   #1 (permalink)
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gear ratio help

Can anyone please help me with info on what I may have for a ring and pinion ratio? The truck is a 1998 Amigo, 2.2L 4cyl, 5spd 4x4 with the G80 limited slip rear. I could just pull the cover off the rear end and count gear teeth, but I'm working so much overtime that I barely found a spare minute to type this. I also have a probem with the T-case popping out of 4-high, which I think may be caused by internal damage from having two different gear ratios, F/R. I suspect that the front diff had been replaced by Lithia, as they bought this vehicle at an auction, and it has evidence of being in a wreck. The T-case will stay in Low range if I put it there, but sounds really pissed off. I did check to make sure that both boxes have the correct type of oil.
Any help greatly appreciated, and thanks in advance....


Mike Barbarigos
Reno Nv
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Old 10-07-2005, 09:35 PM   #2 (permalink)
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With a '98 4cyl 4x4 Amigo, you could very well have the elusive 4.77 gears. If it was an 'early 98' in respects to production date and/or has an S2J option code listed on the option plate, then the chance goes up a lot.

If that is the case, and the front diff was replaced with one out of another truck... its very likely that the gears are mismatched. The 4.77's came only in the early 1998 4cyl 4x4's, so its unlikely that the replacement front diff also came from such a relatively rare vehicle.

[edit]Just to be perfectly accurate, the 4.77's were also available in some Troopers with the 'wide tire' option (again, not very common). When I said 'only' above, I was refering to the availability of 4.77's in 2nd gen Amigos.
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Last edited by Indyguy; 04-27-2011 at 12:03 AM.
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Old 10-08-2005, 03:10 PM   #3 (permalink)
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Cool gear help: thank you

Thanks, you guys, for helping me with this "little" problem. I just need to find the time to pull the rear cover and count some teeth, and inspect the gears as well, because last night it started making a clicking sound, kind of like a chipped tooth. I think that since I don't have 4wd right now anyways, I may just pull the front diff, half-shafts, and front driveline out of it and prepare myself for the SAS, rather than waste money changing gears on something I only plan to swap out later, when I do the complete drivetrain re-power. OTOH, if the ratios are the same, I'll just fix the T-case for now, since that's the cheapest way out. My wife Kris, and I just had twins Aug. 8, and I'm trying to bring the money tree back to life!!

Mike Barbarigos
'98 Amigo, 33" thornbirds
(hands down, the worst tire I've ever used) 3" of metal trimmed, fenders re-flanged, no lift. No power, either....
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