What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Long doubler

1976Blazer76

1976Blazer76

1/2 ton status
Joined
Apr 17, 2006
Posts
552
Reaction score
1
Location
Ridgefield, WA
Why does everyone seem to want a shorter doubler setup? I would think the longer doubler would be a better way to go because of a longer front shaft. With my setup, I'm running a 40" front drive shaft and a HAD 42* shaft. So wouldn't a longer setup be better because of the longer front drive shaft?

CIMG0861.JPG
 
1976Blazer76 said:
Why does everyone seem to want a shorter doubler setup? I would think the longer doubler would be a better way to go because of a longer front shaft. With my setup, I'm running a 40" front drive shaft and a HAD 42* shaft. So wouldn't a longer setup be better because of the longer front drive shaft?
Click to expand...

A short doubler is needed for the short wheel base vehicles (blazer) a truck or burb would be no troubles with a longer doubler.
 
4X4HIGH said:
A short doubler is needed for the short wheel base vehicles (blazer) a truck or burb would be no troubles with a longer doubler.
Click to expand...

I am running a blazer, but maybe its because I moved my axle back 7.5". It just seems even the people running trucks and suburbans even go for the shorter setup
 
1976Blazer76 said:
I am running a blazer, but maybe its because I moved my axle back 7.5". It just seems even the people running trucks and suburbans even go for the shorter setup
Click to expand...

A blazer with axles (rear in particular) in the factory location the doubler needs to be as short as possible in order to have a rear driveshaft with angles that are acceptable to not cause vibrations or binding.
 
i dont think that you are comprehending that pretty much no matter what way you set up the doubler you are lengthening the front alot due to the addition of the range box....and the adapter.... so thats roughly 10 inches. you for some reason want your front to be 20 feet long and have your rear be a foot and a half when the rear is really the only one that matters. imo

edit: did you use that rare sm465/203 adapter in your setup? because that woul explain it all :edit
 
blazerboss 85 said:
i dont think that you are comprehending that pretty much no matter what way you set up the doubler you are lengthening the front alot due to the addition of the range box....and the adapter.... so thats roughly 10 inches. you for some reason want your front to be 20 feet long and have your rear be a foot and a half when the rear is really the only one that matters. imo

edit: did you use that rare sm465/203 adapter in your setup? because that woul explain it all :edit
Click to expand...

Actually my rear is 38" long which I do beleive would be just around as long as a stock rear. My front is only 40" long which is 228 inches less than your 20 foot estimate.

And no, I didn't use the rare 465/203 adapter which is only about 2 inches long, if you were to look at my picture you would see that it is longer than that, I actually used a 465/208 adapter
 
blazerboss 85 said:
i dont think that you are comprehending that pretty much no matter what way you set up the doubler you are lengthening the front alot due to the addition of the range box....and the adapter.... so thats roughly 10 inches. you for some reason want your front to be 20 feet long and have your rear be a foot and a half when the rear is really the only one that matters. imo

edit: did you use that rare sm465/203 adapter in your setup? because that woul explain it all :edit
Click to expand...

Also, please explain your reasoning for the rear being the only one that matters. I would partially agree if this was a street only rig, but someone with a doubler is probably doing a fair share of offroading.
 
1976Blazer76 said:
I actually used a 465/208 adapter
Click to expand...

I used the same adapter and it worked out perfectly. Both driveshafts are approx. same length and both have very managable angles.

I think its easier to accomodate a harsher angle in the rear then the front. The rear its not too big of a job to chop some perches off and tip the pinion. Using a CV shaft you can reduce angles pretty quickly. Of course doing this in the front isn't so simple.
 
1976Blazer76 said:
Also, please explain your reasoning for the rear being the only one that matters. I would partially agree if this was a street only rig, but someone with a doubler is probably doing a fair share of offroading.
Click to expand...

oh yes of course they will be doing much offroading but i mean for me personally i alwans want my rig to be able to dr4ive to the trail its going to and those trips can be as long as 200 miles(more than that id tow) they may be slow trips but worth it because you know your truck drove there conquered and then made the trip back but back to the rear driveshaft. the more angle ive got the more it vibes which in turn means u joints coming apart at highway speed ( happened to me before) so im just saying for road driving its awfu but if you tow everywhere no biggie
 
1976Blazer76 said:
Actually my rear is 38" long which I do beleive would be just around as long as a stock rear. My front is only 40" long which is 228 inches less than your 20 foot estimate.

And no, I didn't use the rare 465/203 adapter which is only about 2 inches long, if you were to look at my picture you would see that it is longer than that, I actually used a 465/208 adapter
Click to expand...

haha well i dont understand why your front shrunk then but oh well its a mystery to me because that adapter is abot the same as the stock 465 205 adapter and i cannot look at your picture because i am not a member:(
 
cybrfire said:
I used the same adapter and it worked out perfectly. Both driveshafts are approx. same length and both have very managable angles.

I think its easier to accomodate a harsher angle in the rear then the front. The rear its not too big of a job to chop some perches off and tip the pinion. Using a CV shaft you can reduce angles pretty quickly. Of course doing this in the front isn't so simple.
Click to expand...

Thanks for the input Kert! That was exactly my thinking I just wanted to make sure it was right because there are different opinions on this.
 
It would also be simpler to move the rear axle, rearward to gain more length than the front, forward. At some point, the front forward becomes a situation in the steering geometry.

Yep, there are work arounds for all of it, just less needed in the rear.
 
cybrfire said:
It would also be simpler to move the rear axle, rearward to gain more length than the front, forward. At some point, the front forward becomes a situation in the steering geometry.

Yep, there are work arounds for all of it, just less needed in the rear.
Click to expand...

Getting set up for full hydro in the front so won't be a problem. Got your B52 kit bolted up:D.
 
In my opinion length of the doubler seems to be more of a problem for the auto tranny crowd, sm465s are so short it it doesnt matter as much if you have a long doubler.
 
You must log in or register to reply here.

Latest Posts

Top Bottom