gearing questions and diff carraige
Veteran
Joined: Dec 2010
Posts: 492
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From: Brownsburg, IN
Champion
Joined: Sep 2011
Posts: 3,891
Likes: 8
From: NorCal
Newman's link confirms the carrier breaks. For D60/D70 4.56 and up is a break.
Yes the dodge D70 is 32 spline.
So....you want 4.10 or 4.56? I'm unsure from what you've posted as to your want.
For the front, I have a line on a ARB for a D60. It's in a front Dodge axle currently. I'd have to recheck the spline count. It was installed with 5.13 r&p. Priced at $750 It is 30 spline, but his outers are 35 spline Cromo. Passenger side CAD delete -- single shaft too.
For the rear, and not knowing what you're doing with the rig (i.e., types of terrain) I'll say a Detroit is plenty good. They are streetable and will chirp a bit if your turning a good pace. You can keep it down taking your time. Detroit will be more forgiving in this regard than the trutrac. Truthfully, I'd really recommend you get a factory LSD for the rear from your brief description. Check out the Cummins forums. Use "searchtempest.com" to search Craig's List.
Yes the dodge D70 is 32 spline.
So....you want 4.10 or 4.56? I'm unsure from what you've posted as to your want.
For the front, I have a line on a ARB for a D60. It's in a front Dodge axle currently. I'd have to recheck the spline count. It was installed with 5.13 r&p. Priced at $750 It is 30 spline, but his outers are 35 spline Cromo. Passenger side CAD delete -- single shaft too.
For the rear, and not knowing what you're doing with the rig (i.e., types of terrain) I'll say a Detroit is plenty good. They are streetable and will chirp a bit if your turning a good pace. You can keep it down taking your time. Detroit will be more forgiving in this regard than the trutrac. Truthfully, I'd really recommend you get a factory LSD for the rear from your brief description. Check out the Cummins forums. Use "searchtempest.com" to search Craig's List.
i think its the HD version of the D70. the front is a D60, i think the rear is a 32 spline if im not mistaken. im just getting frustrated at trying to find parts. it almost makes me want to keep the 3.55's. the sticker says its got a GVRW of 8800Lbs. the information i find online however states the D70 is 32 spline BUT is a 7500Lbs rating so idk if there is a difference.
i am trying to figure out what to do here and im at my witts end. i cant seem to find a good fit.
i currently run 36" toyo tires on a 99 long bed quad cab. its got 3.55 ratio with a factory limited slip rear. i am thinking i want to go up to 4.56 to bring things back to a stock feel. in the front i KNOW i want a selectable, either OX or ARB but the rear is whats screwing me over...
i cant find a LSD outside of a trac-lok or a detroit for my dana 70. i fear the detroit would be to extreme for a street truck that will only get some off road and also may end up towing. i can find some eatons for 4.10 and down but none for 4.10 and up, so im thinking... maybe i can take my factory LSD and use some kind of spacer or thick gears to add 4.56 in the rear. maybe i can buy a new carraige and install a lock rite, or i can spend a load more cash and buy an ARB for the rear. i just dont think i need a selectable in the rear...
what do you guys think? is a detroit to much? is a lock rite strong? should i go selectable? cost is a major issue here... if i can spend 600.00 on the rear diff instead of 1200.00 that would be huge. i CAN drop the money for a ARB front and rear but i have more to repair on this truck than just gearing.
thanks
i currently run 36" toyo tires on a 99 long bed quad cab. its got 3.55 ratio with a factory limited slip rear. i am thinking i want to go up to 4.56 to bring things back to a stock feel. in the front i KNOW i want a selectable, either OX or ARB but the rear is whats screwing me over...
i cant find a LSD outside of a trac-lok or a detroit for my dana 70. i fear the detroit would be to extreme for a street truck that will only get some off road and also may end up towing. i can find some eatons for 4.10 and down but none for 4.10 and up, so im thinking... maybe i can take my factory LSD and use some kind of spacer or thick gears to add 4.56 in the rear. maybe i can buy a new carraige and install a lock rite, or i can spend a load more cash and buy an ARB for the rear. i just dont think i need a selectable in the rear...
what do you guys think? is a detroit to much? is a lock rite strong? should i go selectable? cost is a major issue here... if i can spend 600.00 on the rear diff instead of 1200.00 that would be huge. i CAN drop the money for a ARB front and rear but i have more to repair on this truck than just gearing.
thanks
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Rookie
Joined: Apr 2011
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From: st. paul mn
I have been stuck in stupid **** to many times to keep an open front. i was looking at an OX locker as its cheaper than an arb.
id be going with 4.56 gearing i believe due to my 35" tires, i think 4.88 is to high and 4.10 to low.
i will be hauling, street running, towing (5th wheel), and a few other uses. I see on the diff site that if i go 4.56 i will need a new carriage. i was thinking on rebuilding my factory LSD in the rear as it seems to be doing well and i worry that a Detroit may be to aggressive for towing. if i did rebuild the factory then i would need to use thick gears to utilize the factory carriage assembly on 4.56 gearing.
the only other thing im thinking of is perhaps changing spline count but i think i have the medium to heavy grade spines as is. if i remember correctly my rear was a 35 and front was a 32 (off the top of my head i may be wrong about that).
i was planing to buy all the bearings and shims for the rebuild but had not looked at a kit.
id be going with 4.56 gearing i believe due to my 35" tires, i think 4.88 is to high and 4.10 to low.
i will be hauling, street running, towing (5th wheel), and a few other uses. I see on the diff site that if i go 4.56 i will need a new carriage. i was thinking on rebuilding my factory LSD in the rear as it seems to be doing well and i worry that a Detroit may be to aggressive for towing. if i did rebuild the factory then i would need to use thick gears to utilize the factory carriage assembly on 4.56 gearing.
the only other thing im thinking of is perhaps changing spline count but i think i have the medium to heavy grade spines as is. if i remember correctly my rear was a 35 and front was a 32 (off the top of my head i may be wrong about that).
i was planing to buy all the bearings and shims for the rebuild but had not looked at a kit.
Record Breaker
Joined: Dec 2006
Posts: 1,366
Likes: 1
From: Englewood, CO
You should go locker up front and LSD in the rear since you want/need an all around kind of rig. With street and towing the LSD will be better and less expense in my opinion. I have an OX in the front and Auburn LSD in the rear.
The heavier the load, the less aggressive a detroit would feel. I understand where you are coming from though. Fyi your dana 80 rear = 35 spline, dana 60 front = 30 spline. I wouldn't worry about upgrading.