Another gearing question.
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Elder User
Joined: Jul 2004
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From: Fredericton NB, Canada
Another gearing question.
I have an 84 Bronco. Firstly, I would like to just confirm whether it is an 8.8 or a 9". Im pretty sure its a 9" but would just like to be reassured.
Secondly, if I change my grearing in the rear end to 3.73's or 4.11's, then does the front differential have to be re-geared the same?
Thanks,
Matt
Secondly, if I change my grearing in the rear end to 3.73's or 4.11's, then does the front differential have to be re-geared the same?
Thanks,
Matt
Elder User
Joined: Feb 2004
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From: Oregon
I think you're right. I don't have my spec book in front of me, but I believe the 9" stopped in '86. Another easy way to tell, is that the 9" has no rear cover. There are no bolts on the back.
Yes, you have change front gears when you do rear gears. Otherwise when you're in 4WD, your front tires will turn faster than your rear tires, which will cause major driveline damage.
Yes, you have change front gears when you do rear gears. Otherwise when you're in 4WD, your front tires will turn faster than your rear tires, which will cause major driveline damage.
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Elder User
Joined: Jul 2004
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From: Fredericton NB, Canada
Whatcho talkin about Willis. What do you mean there is no rear cover? Now granted I havent had much reason to be looking at my trucks rear end, but how would you change the gears without a rear plate? Or am I just completely burnt? 
-Matt.
-Matt.
Tuned
Joined: Mar 2004
Posts: 400
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From: South Texas
The 9 inch is a third member type rear. That is there is no rear cover because after pulling out the axle shafts the third member, pig, pumpkin (how ever you like to call it) unbolts from the front and pops out along with the ring gear, carrier, and all it's guts.
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Elder User
Joined: Jul 2004
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From: Fredericton NB, Canada
Im sorry, did I hit a nerve? 
I didnt expect expect to have smileys firing away at me. I wasnt trying to be smart, I was just joking around. I genuinely thought that my 84 rear end had a cover plate like my old 88 f150 which I had changed before. Sorry if you had taken it the wrong way.
-Matt
I didnt expect expect to have smileys firing away at me. I wasnt trying to be smart, I was just joking around. I genuinely thought that my 84 rear end had a cover plate like my old 88 f150 which I had changed before. Sorry if you had taken it the wrong way.-Matt
Last edited by MatthewC; Sep 5, 2004 at 01:39 PM.
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Elder User
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From: Fredericton NB, Canada
Yes that anwered my question. Basically I just wanted to know if it was a 9 or an 8.8 and whether both from and rear gears had to be geard the same. It makes sense that they do. The 8.8 on my old 88 f150 was easy to work on, at least to weld the crap out of it, for the good old Lincoln Locker. Changing the gears on the 9" seems to be a little more involved. Im just in the process of deciding whether to go with 3.90's, or 4.11's. Ive got a 3 speed auto, with 31's, soon to be 33's, and the truck seems sort of gutless with the stock gears that were mated with the original 235 tires.
Thanks for the responses.
-Matt
Thanks for the responses.
-Matt
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Tuned
Joined: Mar 2004
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From: South Texas
I have an 88 bronco with a 5.8. It had 3.55's with 33's and it sucked. I put on 4.11 and it is doing good. I can spin the 33's when I want to or pull just about anything. My only regret is that I did'nt go with 4.56 so I can keep that power when I up grade to 35's.
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Tuned
Joined: Mar 2004
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From: South Texas
I get about 14 mpg on the highway turning 2300 rpm at 70mph. If I was staying with 33's I'd be perfectly happy. I might be satosfied when I put on the 35's but now that I have felt the power of the 4.10 on 33's I think I might be dissapointed with the perforomance I'll get with the larger tires.
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