Offroad Trailblazers and Envoys

8.6 EXT rear end swap into a SWB...driveshaft questions?

G80, GU6, GT4, GT5, WTF? This section is for gearing and driveline stuff.

by Timberwolf » Thu Mar 02, 2017 12:29 pm

I'm doing this swap after work tonight. Just got thinking... will the driveshaft need to be a different length? I'm putting a 8.6 in place of the 8.0 in my SWB 2003... if I need something different for a DS I don't want to start the swap until I have the right unit or get mine shortened if that's what it needs
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by TBYODA » Thu Mar 02, 2017 12:40 pm

Timberwolf wrote:I'm doing this swap after work tonight. Just got thinking... will the driveshaft need to be a different length? I'm putting a 8.6 in place of the 8.0 in my SWB 2003... if I need something different for a DS I don't want to start the swap until I have the right unit or get mine shortened if that's what it needs


No you are good, only swapping to the much bigger SS axle (9.5 ring gear) need a adapter 477 and shorting of DS.

Now would be good time to check the U-joins once the driveshaft is off the truck. There should be no play. If there is the OEM joints will need to be burnt out. You will see two white plastic injection spots. Heat the main body of the DS where these injection spots are until the plastic stops coming out, you will need a lot of heat, I had to use two gas torches. I had to replace my rear joint like a couple weeks before I swapped, go figure. :lol:
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by Timberwolf » Thu Mar 02, 2017 12:47 pm

Awesome. Thanks for the advice!

I am curious to see how much more entertaining these 4:56 gears and the Detroit truetrac make the ride.
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by Anthony Hernandez » Thu Mar 02, 2017 4:53 pm

Why didn't you just get a locker?
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by TBYODA » Fri Mar 03, 2017 1:02 am

Anthony Hernandez wrote:Why didn't you just get a locker?

Because he had a 8.0" and there are only two options a G80 and true track.

There is a third option and it's what I'm going with, Miller. :thumleft:


Image
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by bartonmd » Fri Mar 03, 2017 8:48 am

TBYODA wrote:
Anthony Hernandez wrote:Why didn't you just get a locker?

Because he had a 8.0" and there are only two options a G80 and true track.


Sounded like he was talking about putting a TT into his new 8.6

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by Anthony Hernandez » Fri Mar 03, 2017 7:32 pm

Yes it did mike, thanks for that. And also I didn't know the 4.56 fit into 8, then again, I never looked. I thought 4.11 was it.
Last edited by Anthony Hernandez on Sun Mar 05, 2017 2:05 pm, edited 1 time in total.
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by Timberwolf » Fri Mar 03, 2017 7:38 pm

Yes, I did 4.56 gears and a Detroit truetrac into an 8.6. Reason being it was cheaper for the truetrack than the locker by a couple hundred and the street manners are better, which is where my rig spends 99% of its time.
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by Timberwolf » Fri Mar 03, 2017 7:39 pm

20170302_225306.jpg


Finished it up last night
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by Nexus1155 » Sat Mar 04, 2017 2:02 pm

How is it with the new setup. It's something i dream of doing but always fear getting stuck with the g80. Just did a drain and fill last weekend and all the bolts were siezed anyway.
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by TBYODA » Sun Mar 05, 2017 2:27 pm

TBYODA wrote:
Anthony Hernandez wrote:Why didn't you just get a locker?

Because he had a 8.0" and there are only two options a G80 and true track.

There is a third option and it's what I'm going with, Miller. :thumleft:


Image



Ok which mod is being a funny guy. I never posted this. LMAO

Why would I weld my new SS G86?
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by NC_IslandRunner » Tue Mar 07, 2017 6:08 pm

My bad, don't sleep post, almost as bad as drunk posting.
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by TBYODA » Wed Mar 08, 2017 10:55 am

NC_IslandRunner wrote:My bad, don't sleep post, almost as bad as drunk posting.

It all good, its funny shit.
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