Jump to content

Rear end swap upgrade


Edrowesuave

Recommended Posts

Hank, I'm just a few days away from back on the road and will take that mountain drive again, it's a good test run for if something goes wrong, I just do a U turn and coast back home.

My goal is to go to Tims via Yosemite. Stay there for a nigth then on to Tims.

edit: Problem is that Darlene and the kids want to go to the BBQ and the truck only holds three. May have to put one in the bed!

Edited by pflaming
  • Like 1
Link to comment
Share on other sites

 I'm trying to pull the axle shaft out and it doesn't want to come out.I'll try using Young Ed's PVC spacer method tomorrow.I really like HanksB3B's axle puller.I think I have some pvc laying around here somewhere.

After I get the axle out I hope to find a replacement.

I think it's pretty neat how you can swap out the gear assembly on these 8.75 mopar rearends

 

Correction it's really Arnold's invention that he made for Davin. I'm sure Davin weould loan it to me but it would cost near $100 to ship from the land down under Oz, (as they call it).

 

Look at what a beautiful job Davin did:

 

Davin-01_zpsa5c92d02.jpg

 

 

 

Try it you'll like it. They aren't in there that hard.

 

Young Ed's never let me down yet ! 

 

I'm busy with Mark's radio so let me know how it goes..

 

Hank  :)

Link to comment
Share on other sites

Good news everyone,I found a 1968 Dodge Coronet for parts.It has a 8.75 Mopar rear end gear ratio is 3.73 (good for these mts). It has the brakes and parking brake cable.He wants $175 The the spring perches are 44" apart just like mine.I'm gonna go get it.

I'm also gonna need to upgrade the brake master cylinder.

Edited by Edrowesuave
  • Like 1
Link to comment
Share on other sites

Good news everyone,I found a 1968 Dodge Coronet for parts.It has a 8.75 Mopar rear end gear ratio is 3.73 (good for these mts). It has the brakes and parking brake cable.He wants $175 The the spring perches are 44" apart just like mine.I'm gonna go get it.

I'm also gonnaneed to up grade the brake master cylinder asap.

 

BUY IT!!! BUY IT!!!!

You should really buy that. ^_^  

 

48D

Link to comment
Share on other sites

Gee I got ripped off... $100 more for the whole car...?

 

No I'm really very happy (thrilled it's been a long wait) with my deal and have way too much metal for an apartment dweller.

 

Good Luck with that,

 

Hank  :)

 

P.S. OSH Hardware cut a 1-foot piece of 4" PVC for me this evening..gunna give Ed's method a go soon.

Link to comment
Share on other sites

must be the year of the differential, found a 53 plymouth donor  post-6005-0-73497500-1422044593_thumb.jpg post-6005-0-18459200-1422044716_thumb.jpg

was going to swap the rear axles but, the plymouth was shorter post-6005-0-04197200-1422044923_thumb.jpg and i am lazy so i had the side gears from the 4.10 switched with the 3.73

post-6005-0-23280900-1422044797_thumb.jpg a few shops told me this would not work. we'll see.... this is what i ended up with post-6005-0-99086600-1422044817_thumb.jpg (note on the ring gear it even had the 3.73 stamp on it)

Fingers crossed :)

 

Link to comment
Share on other sites

What a Rookie move on my post, yes the Plymouth is 16 and the truck is 10. My big concern right now is the 3.73 gear looks to be "thicker" and it shifts the adjusters out 1/8" on one side and the other side adjuster in in by the same.

I am hoping this is not critical.

Link to comment
Share on other sites

I'm working on converting another diff over now. I picked up another 1955 Dodge car 3.54 diff center a few weeks ago, and I collected a good truck diff housing yesterday - the diff housings seem to rust badly where the dirt and water sit between the shock absorber mounting plate and the diff axle housing. I've found that the 1955 cars here in Oz appear to have the same 16 spline count as the trucks, but the car axles are about 1 inch shorter than the truck axles (see photo - rusty axle is an old truck one which I had in the shed). I hope to have this second 3.54 diff built up soon and will use it to replace the 4.1 diff in my blue 52 truck.

post-3915-0-77581700-1422089885_thumb.jpg

post-3915-0-22549300-1422089903_thumb.jpg

post-3915-0-05427900-1422090016_thumb.jpg

  • Like 1
Link to comment
Share on other sites

ok, for all who knew it.... the 1/8" does matter! post-6005-0-60652600-1422131987_thumb.jpgpost-6005-0-45930400-1422132004_thumb.jpg

 it pushes the axle bearing into the backing platepost-6005-0-19616300-1422132036_thumb.jpg

when I took it to the shop, I showed the salesman the book and asked him to remove the "differential case cap" and pull the gears and he is the one that suggested just swapping the ring and pinion gear..... I should have insisted.  I will have to check with the shop Monday to make it right.

 

 

On the positive side I found the stamp on both housings for the gears ratios   :)

on top of the 3.73 post-6005-0-14080400-1422132059_thumb.jpg

and bottom side of the 4.1 next to the plug post-6005-0-76454600-1422132076_thumb.jpg

Link to comment
Share on other sites

  • 2 weeks later...

picked up the completed 3rd member again after the shop took apart the original "closed" carrier and swapped the 10 tooth side gears for the 16 tooth side gears  post-6005-0-71439900-1423278279_thumb.jpg

for those who are thinking about doing it themselves, I am told taking apart the closed carrier took about 4hrs at the shop. (glad I left them a copy of that part of the shop manual)

the only thing that came up was the question of the "cut" of the gears post-6005-0-13694000-1423278307_thumb.jpgpost-6005-0-75644900-1423278339_thumb.jpg

they are a little different from the original 4.10 and the Plymouth 3.73.  but every thing works!

so for those who are budgeting this project I spent $100. on the used 3.73 rear differential and $450. for the shop to switch everything and replace all the bearings and seal.  

  • Like 1
Link to comment
Share on other sites

I do not know if this helps but when building my 52 b3b, needed to replace driver side axel. one of my parts truck was a 53 b4b it had fine thread axel my 52 was course thread . So I tried one out of 49 it would fit. makes me think a 53 fine would have fit your car chunk I was told to get the same year 52 car chunk and it would fit. I decided to go with jeep axel for better stopping.   hop this might help Robert

Edited by Robert Thornton
  • Like 1
Link to comment
Share on other sites

I remember reading about disassembling the carrier in the shop manual and recalling it looked like a biotch! I think there's a special spanner tool or something needed to unscrew the cover plate...? Plus, it's probably torqued on there like an SOB...

 

Any situation like this where you have a large diameter screw-in cap ain't easy. My father in law recently had a hell of a time getting the "cap" off a hydraulic ram for his tractor flail mower attachment, just to replace the seal.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.

Terms of Use