Transmission Swap help-
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Transmission Swap help-
We have a 1991 Bronco that we want to swap out a dead transmission for.. the dead one is a EAOD..
My husband DOSN'T want another one of those put into it. (We have 40 inch tires and a 9 inch lift)
How difficult is it to swap a AOD or even better a C6 into this truck??
What parts need to be changed out with it as well?
It will be attached to a 302 engine..
Please Advise---
My husband DOSN'T want another one of those put into it. (We have 40 inch tires and a 9 inch lift)
How difficult is it to swap a AOD or even better a C6 into this truck??
What parts need to be changed out with it as well?
It will be attached to a 302 engine..
Please Advise---
Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
C6 would be the best option due to its strength but lacks an OD gear.
the AOD i would not even attempt given what you have setup on the rig it wouldnt last long at all period.
if you want strength and retain the overdrive i would recommend either a rebuilt and upgraded e4od. this will run you about $3000 give or take.
Also you could look into a ZF 5speed manual swap. This tranny is very similar to the old school NP435. the zf has a granny low first gear and of course the OD gear which is .70
What gears are you running in the bronco?
just so you know the E4OD is the same as a C6 but with overdrive.
what do you use the rig for? is it a mall cruiser or is it an offroader?
what axles is it running.
the AOD i would not even attempt given what you have setup on the rig it wouldnt last long at all period.
if you want strength and retain the overdrive i would recommend either a rebuilt and upgraded e4od. this will run you about $3000 give or take.
Also you could look into a ZF 5speed manual swap. This tranny is very similar to the old school NP435. the zf has a granny low first gear and of course the OD gear which is .70
What gears are you running in the bronco?
just so you know the E4OD is the same as a C6 but with overdrive.
what do you use the rig for? is it a mall cruiser or is it an offroader?
what axles is it running.
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we are running a 4.58 rear gear with detroit lockers.. the truck is just being used as a run around truck, not on expressways often .. Maybe a little muddin, but not usually.. there is a 8.8 axle shaft rear housing but as to the axles themselves I'm not sure on the size (just got the housing rewelded and fixed last month) Thank you for your help on this.
Hotshot
Joined: Jul 2002
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From: Bend,OR
has your current tranny ever been rebuilt?
honestly you have a couple things working against you here. First those tires are to big for both the gear ratio, and the motor your running not to mention the front/rear differentials.
you should be running at least a 5.13 or lower gears to keep from frying another transmision regardless what it is. also the max tire size rating for the differentials you have is 35" tires. your well exceeding that.
dont think i am getting down on you guys or anything like that. I am an avid offroader/bronco owner and just want to help folks enjoy there rigs with the least amount of downtime / breakage as possible.
honestly you have a couple things working against you here. First those tires are to big for both the gear ratio, and the motor your running not to mention the front/rear differentials.
you should be running at least a 5.13 or lower gears to keep from frying another transmision regardless what it is. also the max tire size rating for the differentials you have is 35" tires. your well exceeding that.
dont think i am getting down on you guys or anything like that. I am an avid offroader/bronco owner and just want to help folks enjoy there rigs with the least amount of downtime / breakage as possible.
Lead Driver
Joined: May 2009
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From: Tobyhanma, PA
I agree with Kemical here. No matter what transmission you put in there, you're just making something else the weakest link.
Honest advice, Swap the 9" lift for a 6" and sell the 40's for 35's. Shouldn't need to do much except remove a block from the rear leaves and swap in 6" coils up front. I think thats all it takes, idk if your driveshaft was lengthened tho. Might cause an issue.
But heck if you're happy with the truck as is, rock on. But its gonna be broken alot.
Honest advice, Swap the 9" lift for a 6" and sell the 40's for 35's. Shouldn't need to do much except remove a block from the rear leaves and swap in 6" coils up front. I think thats all it takes, idk if your driveshaft was lengthened tho. Might cause an issue.
But heck if you're happy with the truck as is, rock on. But its gonna be broken alot.
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Kemical,
I appreciate you advice regarding the gears and tire sizes...
but at this point I need to get the truck moving asap...
yes, the transmission had be replaced by the prior owner, but had not been done properly. (Unknown what was in the truck prior to the current EAOD)
Edgethis,
I cannot take a block off to lower it because the blocks in the rear have been welded together..
but even with all this newfound information, I am still stuck trying to figure out if one can replace a EAOD with a AOD or a C6 and what parts might I need also and how might I go about doing this....
I appreciate you advice regarding the gears and tire sizes...
but at this point I need to get the truck moving asap...
yes, the transmission had be replaced by the prior owner, but had not been done properly. (Unknown what was in the truck prior to the current EAOD)
Edgethis,
I cannot take a block off to lower it because the blocks in the rear have been welded together..
but even with all this newfound information, I am still stuck trying to figure out if one can replace a EAOD with a AOD or a C6 and what parts might I need also and how might I go about doing this....
Lead Driver
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From: Tobyhanma, PA
Yes, you can replace your E4OD with a C4. it'll bolt in, not sure about a C6, if it has the small block bellhousing then yeah. you'll then need to get an ECU for a 3002 with a manual trans so it doesnt throw codes. Also may need to rewire the reverse lights to work. May need to source a crossmember from an 80's truck for the C4/6 as well.
of course you'll need to modify whatever linkage you put in, not too hard.
Lift blocks are cheap and easy to find and replace. Out of curiousity, how many blocks are on your truck since its welded?
of course you'll need to modify whatever linkage you put in, not too hard.
Lift blocks are cheap and easy to find and replace. Out of curiousity, how many blocks are on your truck since its welded?
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Edgethis, Thank you for your direct answer, I highly appreciate the information.
Now to answer your question- now that the blocks have been welded, we only have one large block in the rear..
Now to answer your question- now that the blocks have been welded, we only have one large block in the rear..
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Lead Driver
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From: Tobyhanma, PA
No Problem, wheres the pics anyway? I wanna see this truck. Sounds huge.
I suggest down the road on getting new leaves and getting rid of the block or as much as you can. Tall blocks increase stress on components and generate axle wrap. On a 302 it may not have the power normally, but it still isn't a great idea.
I suggest down the road on getting new leaves and getting rid of the block or as much as you can. Tall blocks increase stress on components and generate axle wrap. On a 302 it may not have the power normally, but it still isn't a great idea.
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The truck is huge.(lets put it this way, the door almost clears my daughter (6) head when opening..hehe). right now its at the shop until we get this transmission thing taken care of.. I will go over there with in the next few days and get some pics for you..
Lead Driver
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From: Gateway to the West
Too much lift... tires too big for the axles... blocks? Seriously BLOCKS with that much lift? Worrying about a dying E4OD is the LEAST of the concern here. 5.13's and D60 axles would be a STARTING POINT if you want that setup to stop eating components. As Kem said, not putting it down but that's a downright scary setup. Its not safe and it will continue to chew up parts because there is too much unsprung weight in the tires for the half-ton rated driveline to be pushing around. Honestly, its surprising something smaller (and weaker) than the transmission hasn't detonated before now.
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From: Tobyhanma, PA
That is a big truck! I assume since the truck doesn't usually see any off road is why things haven't broke. Body looks really clean too. Then again the ground doesn't ever come close to touching it.
Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
great looking truck for sure. if the truck never sees any hwy driving then a C6 would be the way to go. otherwise be prepared to drop the coin on a very well built E4OD. But honestly you could run a stock built E4od if you had better gears in the differentials.
I would just got with a slightly upgraded E4OD and then contact some local offroad shops (not 4wheelparts) and look into a Dana 60 if you wish to continue running that tire or a well built Dana 44 solid axle. out back you can run a sterling 10.25 which is a full float differental and great
I would just got with a slightly upgraded E4OD and then contact some local offroad shops (not 4wheelparts) and look into a Dana 60 if you wish to continue running that tire or a well built Dana 44 solid axle. out back you can run a sterling 10.25 which is a full float differental and great