There is another option aside from swapping out the rear end and making it worthless for towing. You can just install a gear vendors, or US Gear OD or a Brownie and get an extra overdrive and have the best of both worlds
3.55 gears sooo much better
- Thread starter idipwr
- Start date
There is another option aside from swapping out the rear end and making it worthless for towing. You can just install a gear vendors, or US Gear OD or a Brownie and get an extra overdrive and have the best of both worlds
Thatguy
Full Access Member
hhhhhmmmmmmm 3.55 with a E4OD and dually would tow just fine. The old man did it for years with a SRW second gen 12valve cummins and auto pulling a 14K 5er.... it was slow to start rolling but once it did it kept moving and he goes from Oregon to AZ back to Oregon and sometimes to CO.
but I will keep my 4.56 and get a GV OD...... as it stands with the 4.56 I get 15 mpg.
gunz
Full Access Member
I have towed 9k on the hitch with 355, towed just fine. If i had a 5 speed it would have been better.
Shadetreemechanic
Full Access Member
I tow heavy often with my 3.55 and zf-42. It works out well most times but I do find myself looking for a lower first gear when starting out.
My last truck was E4OD with 3.55s and I had no problems starting out. If you are contemplating a tranny swap and think towing will improve look for the later zf-47 with the tall first gear. If i am starting out on steep ground I find I need to use low range on the transfer case pretty often.
If my tranny ever needs to go on the bench I am going to change out the first gear.
Diesel JD
Full Access Member
That's probably 4500# between the trailer and the load. Truck is probably 7000# so you're at 12,500 combined roughly. The truck in my sig does fine with that load one I get going but it's a challenge to maintain speed in traffic where I'm shifting a lot, and that's with a turbo.
Diesel_brad
Dunce
If you think that is slow, just try towing about 15k w 3:55 gears
. It did it. But it didnt like it. Took it back home with my gasser truck
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The Bronco weighs 4500 alone, not sure on the trailer, but I can safely guess around 2000, so a bit more weight then thought.
What I thought was REALLY sad is I couldn't get the truck over 70mph with this trailer hooked up with a washer and dryer in it...
That was flat ground on the freeway - wind resistance? Either way that is so sad - the Tahoe pictured pulled the trailer with ease, the damn thing was filled to the gills.
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I'm hoping a new IP and injectors will help... I'll get it timed when I'm done-
f-two-fiddy
Registered User
14K with a NA 6.9/3.55??? Yeah, I'd guess that was a little slow going?
Yeah, it was slow going up hills, but pulls good on flat ground. The hill between MN and WI on Hwy8 is a ***** if I get stuck behind a slow car. I usually go into the hill as fast as I can in 4th and downshift towards the top 1/3rd.
I'll be dragging my truck to Gilbert with the 6.9 - I need to fix the ZF I've got and get the rest of the turbo parts and I should be set for faster pulling...
I'll be dragging my truck to Gilbert with the 6.9 - I need to fix the ZF I've got and get the rest of the turbo parts and I should be set for faster pulling...
88IDImattman
Full Access Member
i'd love to get the GV unit an not have to touch the rear or maybe put a taller tire on to change the ratio some when i got the truck i was getting right around 19 but tha was keeping it at 55 to 60 max.....
im running 2250RPM at that speed once i break that she drinks alot of dino juice .....i had thought about doing the 22.5 conversion but i can not find a company that makes adapters for my 8x6.5 lug pattern an american force said they didnt know of anything for a 1988 dually an that 19.5 was my limit end game kinda feeling going on right now with me
im running 2250RPM at that speed once i break that she drinks alot of dino juice .....i had thought about doing the 22.5 conversion but i can not find a company that makes adapters for my 8x6.5 lug pattern an american force said they didnt know of anything for a 1988 dually an that 19.5 was my limit end game kinda feeling going on right now with me
Diesel_brad
Dunce
Your 88 axle is the same as every 86-97 sterling 10.25 axle so there are adapters available
88IDImattman
Full Access Member
anyone got an idea who makes them all i keep hearing is no for the 8 x 6.5 lug pattern
Mikey89014
Full Access Member
3.31's and a C6 for me. Best combo i think for durability and drivability
Diesel_brad
Dunce
Arrowcraft makes a set
http://www.amazon.com/Conversion-Steel-Wheels-84-98-Trucks/dp/B001NQFOSI
AmericanForce offers a set
http://www.diesel-accessories.com/page/index/adapters
And here is a set on ebay. I think they are arrowcraft
http://www.ebay.com/itm/22-5-SEMI-B...ruck_Parts_Accessories&vxp=mtr#ht_2345wt_1002
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