Bronco II gear ratio availability

[fix_or_repair_daily]

Hi, I was wondering how common were factory 4.10 gears in the Bronco II line as I am looking to upgrade from my 3.73s. Also will the front and rear ends out of a ranger around the same year swap in?

Thanks in advance, Josh

[projectnitemare]

4.10 gear ratio is probably the least common although they are out there. As far as the front and rear being the same for each vehicle, yes and no. Your BII will have a 7.5 rear axle. The Ranger 7.5 rear axle is not a direct bolt in, it is wider than the BII axle and the mounts will need to be moved. If you are mechanically inclined and have the tools you can to either, cut and weld new mounts for the Ranger axle or install the Ranger gear set into your current housing. You will have a Dana 28 front although I believe the Dana 35 may have been available in 89 and 90, don't quote me on that though. As long as you have the same third member as in your vehicle wheter it be a D28 or D35 all you will need to do is take your current third member out and install the one with the 4.10s, unless you just bought a ring and pinion then it will need to be installed inplace of the 3.73 gear set. As far as installing gear sets, if you don't know what you are doing nor have the tools it is best left to a person with the proper knowledge. If installed inproperly not only will they be noisy but will acceleate the wear of the gear set.

Matt

[Hahnsb2]

Originally Posted by projectnitemare

4.10 gear ratio is probably the least common although they are out there. As far as the front and rear being the same for each vehicle, yes and no. Your BII will have a 7.5 rear axle. The Ranger 7.5 rear axle is not a direct bolt in, it is wider than the BII axle and the mounts will need to be moved. If you are mechanically inclined and have the tools you can to either, cut and weld new mounts for the Ranger axle or install the Ranger gear set into your current housing. You will have a Dana 28 front although I believe the Dana 35 may have been available in 89 and 90, don't quote me on that though. As long as you have the same third member as in your vehicle wheter it be a D28 or D35 all you will need to do is take your current third member out and install the one with the 4.10s, unless you just bought a ring and pinion then it will need to be installed inplace of the 3.73 gear set. As far as installing gear sets, if you don't know what you are doing nor have the tools it is best left to a person with the proper knowledge. If installed inproperly not only will they be noisy but will acceleate the wear of the gear set.

Matt

No, ranger 7.5s the same year of the B2 were narrower, it is still bolt in though. 4.10s are common in auto b2s, all 3 auto b2s weve had have been 4.10 geared. All 4.10 geared b2 also have an LS in the rear.

[metalmacguyver]

not very common but they are out there. it is more dependant on how lucky you are when you visit the junkyard.

[projectnitemare]

Not all Ranger 7.5's bolt in. I was going to put an extra late-88 Ranger 7.5 in my early-89 BII. The spring mounts were not the same distance apart. I didn't think to check that before I went to bolt the axle in.

Matt