Select Trac vs Quadradrive

[JoergM]

So I have the CRD model which comes with Selec Trac vs. the Quadradrive in the V8.

I wonder if I can use the Quadradrive diff carrier in the CRD having then a Quadradrive, which supposed to be better (at least what I was reading in other forums).

I cannot see any indicator that there is any electronic component involved and the axles seem to be the same So I guess i comes down to the diff carrier. Unless the Selec Trac is part of the transfer case.

I still have a Dana 44A axle from my old V8 donor Jeep and wanted to weld a truss on and then install it (with new gear ratio). If the Quadradrive diff carrier would work I do not have to uninstall the existing but can drive it till I swap the entire axle.

[RTB]

Check the forum. I think I remember reading somewhere that you will need to space out the ring gear (or machine some off), as the pinion size is different. Other than that, I believe others have done it.

Edit: Or was it that the carrier is slightly offset?? One or the other.

[JoergM]

Originally Posted by RTB

Check the forum. I think I remember reading somewhere that you will need to space out the ring gear (or machine some off), as the pinion size is different. Other than that, I believe others have done it.

Edit: Or was it that the carrier is slightly offset?? One or the other.

Thanks RTB, I will swap an entire axle from a V8 Limited to the CRD and I will change the ring gear ratio anyway (from 3.73 to 4.56) and have the new gears already available. So that should take care of this. And I have a locker for the front axle with the same gear ratio as well. I would then just need Quadradrive in the rear.

But will read thru the post. Thanks for the hint.

[RTB]

You might need to read up on changing ratios in the CRD. Apparently they throw codes if you do.

[Classic Boy]

I discuss the conversion in a old post. I installed a CRD 3.55 varilock carrier in a 3.73 petrol diff in the rear Dana 44a successfully but you need to use the varilock axles as well. The crd diff in the Dana 35 at the front needs a different carrier to Change the ratio from 3.54 to 3.73 gears or you could make a spacer and use longer bolts.
The varilock does work very well and the car is way more versatile even just the rear varilock. I think I would prefer an ARB front locker if I ever needed more ‘bite’.

[JoergM]

Originally Posted by Classic Boy

I discuss the conversion in a old post. I installed a CRD 3.55 varilock carrier in a 3.73 petrol diff in the rear Dana 44a successfully but you need to use the varilock axles as well. The crd diff in the Dana 35 at the front needs a different carrier to Change the ratio from 3.54 to 3.73 gears or you could make a spacer and use longer bolts.
The varilock does work very well and the car is way more versatile even just the rear varilock. I think I would prefer an ARB front locker if I ever needed more ‘bite’.

Completely forgot to respond to your message. Thanks a lot for the info. I ended up in getting the CAN Bus Filter from the guys from jeepwjs.com. Initially I just wanted to solder the TCM BUT then I read that the filter device also supports an NP242 transfer case swap and it happened that I have one lying around in my basement, ready to be installed (well I still need to fix a couple of things but this is a great option on the long run).

I am planning to swap the entire front axle which is a Dana 30. As far as I can see the front in the CRD is a Dana 30 as well. I have an ARB air locker already installed on it and the gear ration is 4.56. So once the CAN Bus filter is installed and I have the Dana 44a prepped with a truss, I will install the same gear ration on it as well and install it all together. I will then use the vari-lock carrier from the CRD and the axle and run it on the V8 prepped axle.

[Adrian D]

Originally Posted by JoergM

Completely forgot to respond to your message. Thanks a lot for the info. I ended up in getting the CAN Bus Filter from the guys from jeepwjs.com. Initially I just wanted to solder the TCM BUT then I read that the filter device also supports an NP242 transfer case swap and it happened that I have one lying around in my basement, ready to be installed (well I still need to fix a couple of things but this is a great option on the long run).

I am planning to swap the entire front axle which is a Dana 30. As far as I can see the front in the CRD is a Dana 30 as well. I have an ARB air locker already installed on it and the gear ration is 4.56. So once the CAN Bus filter is installed and I have the Dana 44a prepped with a truss, I will install the same gear ration on it as well and install it all together. I will then use the vari-lock carrier from the CRD and the axle and run it on the V8 prepped axle.

Why not tune the TCU?

I've read that ring gear spacers are a tricky endeavor, as the ring gear is centered on the carrier, so unless the spacer has provision for centering the ring gear, it's risky.