Doubler

[84EB]

Has anyone tried putting a 203/205 or 203/D20 behind an RBV trans? People have shafts resplined all the time and you can drill the 203 for whatever bolt-pattern you want. So I don't see why you can't have a 2wd output shaft resplined to Dodge 23 spline. Haven't measured but I would guess the RBV output is to small to respline to 31 spline. Then just put a Dodge input shaft in a Ford 203 range box, or run a dodge 203 range box.

 

[Happy Jack]

Anything can be done but why? Last I saw D&D had kits available. And if you look you can still find others for sale. 205/203 ratios 1.98/2.00 gives a combined 3.98. 1350/1354 ratios 2.48/2.48 gives a combined 6.15.

Guess that's why I have a T&M doubler in my Bronco II and a Stubler for either my X or next RBV.

 

[FireZapper]

You can get a different gear set for the 205. I would love the front dig that comes with a 205. Plus the fact it is gear driven makes it a plus.

 

[84EB]

Why? Because the 203/205 or 203/D20 is stronger. You can twin-stick the 205 and D20, 203/D20 gets you about 4.9:1
Just checking out my options. I have a manual 1350 and an electric 1354. That may be the way I go, but I like the 203/D20 option better. I have run the 1350 behind a V8 with 38" tires for a few years and a buddy has run one behind a V8 with 38" tires and now 42" tires for several years now with no breakage.

The only guy I have wheeled with that run a 1350/1354 doubler broke the rear case. Granted he had 40's with 4.10 gears. Mine will be 35-37" tires with 4.88-5.38 gears

Oh and the 3:1 gearsets and case is for GM applications. AFAIK there is no low gears for a Ford 205.

 

[Maniak]

You can get a different gear set for the 205. I would love the front dig that comes with a 205. Plus the fact it is gear driven makes it a plus.

Where did you find different gear sets for the 205? I've only found them for the chevy version, not the Ford version (different drop side) and IIRC it required a new case too.

~Mark

 

[84EB]

I wish they would make a 3:1 gears for the Ford 205. Then I wouldn't put a doubler in my BII. I'ld just run that with the 435 and 5.38 gears would give 108:1 vs 70:1 with the 2:1

 

[FireZapper]

Yes you need a new case.

 

[84EB]

Center hole is the same for fullsize or RBV, 4.9". The RBV bolt pattern is actually wider than the fullsize. On the fullsize Ford the bolts are about 1" from the edge of the center hole, on the RBV the bolt holes are about 1.5" from the edge of the center hole. There is no room on a Ford 203 to drill and tap for the RBV trans. But from the pics I've found online a Chevy 203 for a TH350 trans or a Dodge 203 may work. I will have to find one that I can see in person to be sure.

ETA-I guess it doesn't have to be resplined to 23, it could be resplined to chevy. I think they used 27-spline, but IDK.

 

[4x4junkie]

The only guy I have wheeled with that run a 1350/1354 doubler broke the rear case. Granted he had 40's with 4.10 gears. Mine will be 35-37" tires with 4.88-5.38 gears

Thats why he broke his. 4.10 gears are WAAAAAAYYYY too tall for 40s (he should've been running 5.38 or even deeper gears). Without enough gear reduction in the axles, you just pile all the torque from the doubler reduction onto the rear case.

5.13 or 5.38 w/37s is well within reason.

 

[84EB]

4.10 are to tall for a 1350/54 doubler and 40's but not for a 203/205 doubler and 44's. May not be ideal but the 205 can take it. I know a guy that runs that with a NP435 trans and breaks u-joints and shafts, t-case stays together. Anyway that's a different subject all together.

Found a pic of a dodge 203 redrilled to Ford round pattern. Looks like there is room for the RBV pattern. The 6 clean holes are the Ford pattern.

 

[84EB]

Anybody got a 2wd M5ODR1 they can measure the output shaft behind the splines?