4.7 in front and 2.8 in rear??

[dntsdad]

New to all this but I know that most people run the 2.8 in front, and the 4.7 in the rear. Is there any issues with running the 4.7's in the crawl box and then putting a 2.8 case behind it.

Everything will be upgraded to 23 spline.

I found a good deal on a used 23 spline crawl box w 4.7 gears in it but i dont want to go dual 4.7's.

This would make my setup 92pickup, 3.4V6, V6 adapter, 4.7 box(single shift), MC07, stock 2.8 case w/dual shifters?

Any concerns that I would have with this setup?

Thanks for any help

[46&2]

I think you would be way lower than is really practical. Most run 2.28/4.7 because it provides a nice wide range of gears. With 4.7s in the front, not only would you put a lot more stress on the rear case components, but you would have pretty much ALL super low gears.

I myself run 2.28/4.7 with 5.29s and 35s. My lowest gear is low enough that even at Rubicon and Fordyce, I rarely use it.

Variety is good!  

[86rustbucket]

  the 3.4 puts out a lot of horsepower,with a 4.7 in your crawl box you would be putting a LOT of torque on the input shaft of the rear case. 

Any concerns that I would have with this setup?

Thanks for any help

i think you would be changing out the input on the rear case pretty soon

[yotatough]

I think you would be way lower than is really practical. Most run 2.28/4.7 because it provides a nice wide range of gears. With 4.7s in the front, not only would you put a lot more stress on the rear case components, but you would have pretty much ALL super low gears.

I myself run 2.28/4.7 with 5.29s and 35s. My lowest gear is low enough that even at Rubicon and Fordyce, I rarely use it.

Variety is good!  

you will end up with the same gearing options with the 4.7 in front or in rear, it dosent matter because you can still use them independently from one another. the problem is the extra torque applied on the input for the rear case, with the 4.7 in the front of it. its been done but I dont know how long itll last if your hard on your junk. I would only do it if you absolutly had to, not just to do it. just my $0.02

[46&2]

you will end up with the same gearing options with the 4.7 in front or in rear, it dosent matter. the problem is the extra torque applied on the input for the rear case, with the 4.7 in the front of it. its been done but I dont know how long itll last if your hard on your junk.

My understanding was with the 4.7 in the front, the gear selection overall would be lower for each gear than the other way around. I guess that makes sense though.

[yotatough]

well because you can still shift each on there own, it ends up to be the same options

[46&2]

well because you can still shift each on there own, it ends up to be the same options

Yeah I see what you are saying. The rear input would definitely be taking a beating though lol

[yotatough]

sorry what I mean is you dont have to always run the 4.7, you can still run the 2.28, the 4.7, or both, so its the same.

[yotatough]

sorry typing at the same time

[86rustbucket]

i have a carb'd 22r with no horsepower and i would be worried about blowing the input shaft on my rear case,

how much HP does a 3.4 put out?

[dntsdad]

thanks guys. My main concern was the output stress into the rear case. Guess i'll pass and keep looking for parts.

[yotatough]

well if its a good deal, then buy it and just switch the gears into your case and put the 2.28 from your case into the crawl box and your set. you gotta pull it all apart anyway.

[yotatough]

i have a carb'd 22r with no horsepower and i would be worried about blowing the input shaft on my rear case,

how much HP does a 3.4 put out?

I think the 3.4 is like 220 or something like that

[EarlKann]

well if its a good deal, then buy it and just switch the gears into your case and put the 2.28 from your case into the crawl box and your set. you gotta pull it all apart anyway.

X2  Gears are gears, they can easily be swapped into the rear case. 

[dntsdad]

hey guys. Well i was wrong the gears were in a complete case so i picked it up. Now I just need a v6 adapter, a 23 spline input gear for my front 2.8 case and dual case adapter.

I am planning to use the stock 5speed from my 92 pickup (R150) > v6 adapter > stock 2.8 case with upgraded 23 spline input > 23 spline MC-07 > 23 spline case in rear with Marlin 4.7.

Am i correct here??

Thanks

[yotatough]

sounds good!

[88_Pathy]

I have the front case as the 4.7.  Haven't had an issue.  Marlin built them and said it is tough as nails and not to worry.

[Rocksurfer]

I have never run that combo but others have said that it is real hard on the 2.8 to be in the rear.

[yotatough]

I have the front case as the 4.7.  Haven't had an issue.  Marlin built them and said it is tough as nails and not to worry.

not saying you will for sure have a failure, just that if you have a choice, it's stronger in the rear case.

[axled89]

    just makes more sense to have that torque 4.7's gears in the back case.  and not trying to push that torque threw the first case with the 2.28's