Rearend Swap Need Help

[kelly]

does it make that noise all the time? i definitely want a detroit and noise doesn't bother me as long as it isn't something breaking down. as i can afford it i want one front and rear. i'm planning on new gears anyway.

 

[sweepersrgr8]

It's not something breaking, just the spider gears disengaging in hard turns, so it's not all the time.

I don't know if they make a detroit locker for the front???

 

[Justshootme84]

You don't want a locker up front anyway, as it would be very hard to turn. If you drive mostly offroad and very little on the highway, the Detroit locker or a minspool is what i would put in the Ford 9" rear. If you do mostly street driving, you may want a limited slip instead. Either leave the front axle "open" or look for a limited slip only.

Check the gear ratio in your front axle, it should be 3.55:1. You can get by with 3.50:1 gears in the rear axle, but the 3.29:1 is too far off to safely use 4wd, and is too low for good pulling power. You can run 31" tires. Look at 4.10:1 for 33's.

 

[kelly]

i was planning on that gear ratio and i've found that a limited slip is more within my budget. i've found alot of parts for a 9" that aren't too expensive. the more i work with this rearend the more i like it. the only question i still have is the speed sensor. still need help.

 

[Justshootme84]

You can do a search on fullsizebronco.com or ford truck enthusiasts

(ford-trucks.com) for the speed sensor mod. This site [broncozone.com] is just getting rolling, but those two have a good database for items like rearend swaps. If you find a good tech article, post a link in the "How-To" forum here. I think something as delicate as welding on the differential ring gear is a proffesional job best left to a competent speed shop with experience in doing that. The Ford 9" is very popular with the racing crowd, too!!!

 

[kelly]

been on ford trucks.com and its a cool site. i like this one better. found enough info and people who have done it to use a mini-spool in my open carrier. one more cheap mod. there's a big argument between a 9" and a D60. people on both sides with valid arguments. but since my offroad budget doesn't have space for a 60 and its parts its a no-brainer. i did find axles on boyceequipment.com but the $1200-1500 for a D60 would buy my lift kit. six in one hand, half a dozen in the other. i did find out that older broncos have the speed sensor in the transfer case or the tranny so i'm looking for info to modify mine. thanks for the help.

 

[Justshootme84]

Yeah, bro, I'm with you on preference for the Ford 9" axle. I'm also considering a spool for the rear, but it's tough on tires on the pavement/tarmack from what i've heard. Still looking on that mod.

Your 93 Bronco uses a system called "speed density" to determine shift changes and motor operation by the ECM or computer, which is read from the VSS (speed sensor) in the rear. The 92 and earlier models used a regular speedometer gear and cable from the t-case. I don't think the two are compatable, but it's worth searching to see how you can "fool" the ECM. Other systems may be affected, like the ABS (brakes). AutoZone.com has a great online library for info on this, but it is sometimes hard to log on to it.

 

[kelly]

thanks for the reply.

the posts that i read about the spool said that it does chew tires and pavement but if you alter your driving style and don't turn as sharp its not too bad. i know a guy who has one in his bronco and he said it does chirp but i haven't noticed alot of tire wear. if anything both rear tires wear evenly versus the right rear going bald first.

i posted a question on Jeffs and they didn't have an answer. i'll check out auto zone. thanks