Gilbert propshaft install with pics

WyoSyclone

Active member
Hey Guys,
I installed my Gilbert propshaft this past Saturday and thought some of you may want to see what is involved. This isn't a complete set of pics, but it gives you the general steps involved....

In this pic I had just taken the stock shaft out and sighted down the side of the stock shift bracket to see what the clearance issue looked like.... yup, looks like it's going to interfere!
OriginalShiftBracket.jpg



So, I installed the new shift bracket with less offset. I think this may have been one of the earlier brackets from Detroit Turbo (is that who made those brackets?) - I bought this complete set up off a fellow member here on the board.... anyway the bracket was too thin and would not tighten up on the shaft. So I clamped a washer to the bracket and used a file to cut the inside of the washer to the same cutout as the keyway in the bracket... problem solved. The visegrips make a nice way of holding the bracket so you don't put any undo pressure on the shift arm as you tighten the bolt.... DO NOT OVERTIGHTEN THIS BOLT!! You don't want to be taking your tranny pan off to replace the shift arm!
Shiftbracket.jpg



Next up was taking the factory Yoke off the front differential and replacing the seal.
YokeOff.jpg



....And installing the new Yoke, and torquing the nut back down to spec...
FrontDiffYoke.jpg



This is the new shaft safely installed in its new home... (ready for some abuse :D )
Installed.jpg



One note.... you can't use the new bolts that were supplied in the kit. The heads are so large that there isn't a tool made that would fit between the bolt head and the shaft at the tranny..... So, I re-used the original bolts...worked out fine.
YokeatTranny.jpg



All in all, not a terribly difficult job. Instead of cutting re-welding the shift cable hold-down bracket at the rear, as the instructions tells you to do, I just bent the bracket a little bit. The cable is still perpendicular to the shift arm so that's OK.... had to readjust the shift linkage just a hair but I thought that was a lot easier than cutting and welding the bracket.

Now I need to get some Royal Purple and flush the front diff, and refill it.... you do lose just a bit of fluid when you take the factory seal out of the housing.

Words to the wise..... I wouldn't try this without being able to get the vehicle on a rack, or if you have a pit like I do. Make sure you buy the 32mm socket for the Yoke nut ahead of time, borrow the yoke puller and a slide hammer seal remover from NAPA... have the torque wrench handy and a tube of loctite!
 

Skyhighsami

GMC Typhoon #1308
Re: Gilbert propshaft install with pics

Is the front propshaft the weak link in the drivetrain or do both need to be replaced when making good power?
 

Foot Performance

Donating Member
Re: Gilbert propshaft install with pics

Skyhighsami said:
Is the front propshaft the weak link in the drivetrain or do both need to be replaced when making good power?

Front is MUCH weaker than the rear. I have never heard of rear driveshaft probelms( I am sure the high horse truck run better ones though)
 

91blazins10

Active member
Re: Gilbert propshaft install with pics

One note.... you can't use the new bolts that were supplied in the kit. The heads are so large that there isn't a tool made that would fit between the bolt head and the shaft at the tranny..... So, I re-used the original bolts...worked out fine.


Mine has them installed not sure how though, when I had to take my transfercase out I took it out with the propshaft still attached because I couldnt loosen them. We need mike(sy2932) to chime in.
 

WyoSyclone

Active member
Re: Gilbert propshaft install with pics

91blazins10 said:
Mine has them installed not sure how though, when I had to take my transfercase out I took it out with the propshaft still attached because I couldnt loosen them. We need mike(sy2932) to chime in.

Well, you can actually get them on and off with an open end wrench - tedious job at best, plus you can't torque them using an open end. I was thinking about going to Fastenal and buying some Grade 8 cap head bolts, but my stockers were replaced not long ago anyway...
 

Skyhighsami

GMC Typhoon #1308
Re: Gilbert propshaft install with pics

I was thinking damn his truck is clean underneath. Then I read the sig....man have I got my work cut out. My Typhoon looks nothing like that.
 

Raist103

Engine Killer, iPhone Killer, Lawnmower Killer
Re: Gilbert propshaft install with pics

what is this Cobalt CAC pump w/Derale fan
 

WyoSyclone

Active member
Re: Gilbert propshaft install with pics

Skyhighsami said:
I was thinking damn his truck is clean underneath. Then I read the sig....man have I got my work cut out. My Typhoon looks nothing like that.

Thanks Sky... wish I could take credit for the frame-off, but it had been done just before I purchased the Sy last December.... I've added all the stuff in my Sig since then :D
...kind of strange working on a vehicle and not looking like a ball of grease afterwards!
 

WyoSyclone

Active member
Re: Gilbert propshaft install with pics

Raist103 said:
what is this Cobalt CAC pump w/Derale fan

Well, I wanted to do something different with the Intercooler upgrade, so I managed to find a GM coolant pump off a supercharged Cobalt, along with some nicely radiussed coolant line elbows (I started a thread here somewhere or you can see it on my Photobucket site). I've got the Derale fan mounted to the rear of the CAC and wired to run all the time....although Code59 may allow me get rid of the ground jumper and adjust the fan turn on via the code... haven't got that far in my tuning yet.
 
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