89 MJ Posted December 21, 2020 Share Posted December 21, 2020 Because we all know that there were a lot of gears that you could get in an XJ/MJ during their production, I think it would be a good idea to come up with a list of gears that you could get and the years that you have found them in for future reference. Please include other years and gear ratios that you have found over the years. 4.56 198?-1992? 4 cyl auto MJs (maybe XJs too?) 4.10 198?-1996? Typically found in 4 cyl, 5 speed MJs and XJs, and some 86s (no idea on 97+) 3.73 1984 (found in an all original 84 XJ) 3.55 1984?-2001 4 cyl 4 speed MJs and XJs, 4.0 auto MJs and XJs 3.07 1987?-2001 (4.0 5 speed XJs and MJs) (89eliminator's 88 4.0 auto, fuel mileage package?) Link to comment Share on other sites More sharing options...
89eliminator Posted December 21, 2020 Share Posted December 21, 2020 you can get 3.07 in Auto 4.0s as well. my 88 had it. Link to comment Share on other sites More sharing options...
89 MJ Posted December 21, 2020 Author Share Posted December 21, 2020 9 minutes ago, 89eliminator said: you can get 3.07 in Auto 4.0s as well. my 88 had it. Interesting, that must have been some sort of fuel economy package. I'll add it to the list. Link to comment Share on other sites More sharing options...
eaglescout526 Posted December 21, 2020 Share Posted December 21, 2020 I can just copy paste all the ratios for each year from starparts and drop them in. Course do we want each MJ year or do we want to look back to 84 and forward to 01? Link to comment Share on other sites More sharing options...
89 MJ Posted December 21, 2020 Author Share Posted December 21, 2020 5 minutes ago, eaglescout526 said: I can just copy paste all the ratios for each year from starparts and drop them in. Course do we want each MJ year or do we want to look back to 84 and forward to 01? I am thinking 84-01 would be great. Lots of us have XJs or MJs swapped with later model parts. Thanks! Link to comment Share on other sites More sharing options...
eaglescout526 Posted December 21, 2020 Share Posted December 21, 2020 Alright. I’ll just run each ratio and just list it’s years available. Link to comment Share on other sites More sharing options...
Pete M Posted December 21, 2020 Share Posted December 21, 2020 21 minutes ago, 89eliminator said: you can get 3.07 in Auto 4.0s as well. my 88 had it. that is so much against the grain that I'm going to need to see some paperwork before I would add that to any list. Link to comment Share on other sites More sharing options...
89eliminator Posted December 21, 2020 Share Posted December 21, 2020 3 minutes ago, Pete M said: that is so much against the grain that I'm going to need to see some paperwork before I would add that to any list. i mean i owned it 15 years ago so i don't know what paperwork I'm going to get lol. but it was verified by opening the cover. who know if it was factory but it showed no signs of being swapped out Link to comment Share on other sites More sharing options...
89 MJ Posted December 21, 2020 Author Share Posted December 21, 2020 5 minutes ago, 89eliminator said: i mean i owned it 15 years ago so i don't know what paperwork I'm going to get lol. but it was verified by opening the cover. who know if it was factory but it showed no signs of being swapped out Unless the whole axle was swapped. 11 minutes ago, eaglescout526 said: Alright. I’ll just run each ratio and just list it’s years available. Sweet! Thank you, no rush. Link to comment Share on other sites More sharing options...
Pete M Posted December 21, 2020 Share Posted December 21, 2020 "paperwork" can be the digital variety of course. far too few of us still have build sheets and window stickers. is the vin in the registry? I've got 0 info to support any 4.0/auto coming like that from the factory. fwiw I blew up and replaced my axle in '98 when the truck was all of 10 years old. dana 35s truly suck. I need a time machine... Link to comment Share on other sites More sharing options...
89eliminator Posted December 21, 2020 Share Posted December 21, 2020 4 minutes ago, 89 MJ said: Unless the whole axle was swapped. thats what i was getting at. u-bolts and such had same amount of rust as everything else Link to comment Share on other sites More sharing options...
89eliminator Posted December 21, 2020 Share Posted December 21, 2020 5 minutes ago, Pete M said: "paperwork" can be the digital variety of course. far too few of us still have build sheets and window stickers. is the vin in the registry? I've got 0 info to support any 4.0/auto coming like that from the factory. fwiw I blew up and replaced my axle in '98 when the truck was all of 10 years old. dana 35s truly suck. I need a time machine... no pics and no VIN registry Link to comment Share on other sites More sharing options...
89 MJ Posted December 21, 2020 Author Share Posted December 21, 2020 44 minutes ago, 89eliminator said: thats what i was getting at. u-bolts and such had same amount of rust as everything else Very interesting. Link to comment Share on other sites More sharing options...
Pete M Posted December 21, 2020 Share Posted December 21, 2020 still could easily have been swapped out early on. maybe someone was trying to hyper mile? who knows. without any official info it's hard to say. Link to comment Share on other sites More sharing options...
derf Posted December 21, 2020 Share Posted December 21, 2020 I have also heard of 3.31 gears being optional in the early years. Rare in the XJ/MJ but possible. Link to comment Share on other sites More sharing options...
eaglescout526 Posted December 21, 2020 Share Posted December 21, 2020 Derf is correct on the 3.31. Probably as rare of an option as the 4.56. Link to comment Share on other sites More sharing options...
omega_rugal Posted December 21, 2020 Share Posted December 21, 2020 5 hours ago, 89eliminator said: you can get 3.07 in Auto 4.0s as well. my 88 had it. really? how did it performed? are you sure it came factory? Link to comment Share on other sites More sharing options...
89 MJ Posted December 22, 2020 Author Share Posted December 22, 2020 4 hours ago, derf said: I have also heard of 3.31 gears being optional in the early years. Rare in the XJ/MJ but possible. Interesting. I’ll add it to the list tomorrow. Link to comment Share on other sites More sharing options...
Eagle Posted December 22, 2020 Share Posted December 22, 2020 The '86 XJ hulk I have out back has 3.73 gears. 2.8L auto. Link to comment Share on other sites More sharing options...
Pete M Posted December 22, 2020 Share Posted December 22, 2020 car-part.com can help you with what ratios were available each year. search MJ rear axles if you want to weed out the XJ stuff Link to comment Share on other sites More sharing options...
cruiser54 Posted December 22, 2020 Share Posted December 22, 2020 18 hours ago, Pete M said: that is so much against the grain that I'm going to need to see some paperwork before I would add that to any list. Agreed. Of the 13 Comanches I had as demos at the dealership, I personally ordered about 10 of them. 3.07 with auto was never an option. Link to comment Share on other sites More sharing options...
89eliminator Posted December 22, 2020 Share Posted December 22, 2020 20 hours ago, omega_rugal said: really? how did it performed? are you sure it came factory? it sucked lol. no I'm not sure it came from the factory that way. was just how it was when i bought it. Link to comment Share on other sites More sharing options...
ghetdjc320 Posted December 25, 2020 Share Posted December 25, 2020 Let us not forget about YJ axles. 3.07-4.10. 3.55’s originally in my 88 with BA10/5 and 4.2 Link to comment Share on other sites More sharing options...
billyblankss Posted January 31, 2021 Share Posted January 31, 2021 On 12/21/2020 at 12:47 PM, Pete M said: "paperwork" can be the digital variety of course. far too few of us still have build sheets and window stickers. is the vin in the registry? I've got 0 info to support any 4.0/auto coming like that from the factory. fwiw I blew up and replaced my axle in '98 when the truck was all of 10 years old. dana 35s truly suck. I need a time machine... I have an 88 sport truck with Dana 35 and 3.07 in the rear. 4.0 inline 6 engine. Went wheeling yesterday and had a blast but got stuck once had to winch out... But my buddy's wrangler on 35s had no issue. My axle just barely stuck on that rut. I'm running 33s. I really didn't want to regear because I assume it's at least a grand but idk . Link to comment Share on other sites More sharing options...
Pete M Posted January 31, 2021 Share Posted January 31, 2021 10 minutes ago, billyblankss said: I really didn't want to regear because I assume it's at least a grand but idk . it's worth every penny. it'll put a huge smile on your face each and every time you punch the gas. just don't regear a dana 35. invest your cash in an axle that will last. Link to comment Share on other sites More sharing options...
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