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Username Post: 3.55 rearend "rock and knock"        (Topic#360718)
2ndtime50guy 
"4th Year" Silver Supporting Member
Posts: 1809
2ndtime50guy
Loc: Midwestern U.S.A.
Reg: 04-06-12
04-29-20 01:34 PM - Post#2792375    

Hello friends, from a 49-54 forum guy!

I just finished up my driveline swap on my 1950. I am running my original 216, through a 1955 bellhousing, to a T5 from an S10, with a jeep input shaft to keep my original clutch and pedals, followed by a newly shortened 1955 open driveline driveshaft with an S10 slip yoke and an adapter weld yoke. The driveshaft ties into a 1955 3.55 rearend with new axle bearings.

The rear suspension is a Gambino Notch and 4 link, with Slam Specialties 6" bags and I have a Ridetech air system in the mail.

on the first test drive Monday, the car drives and handles extremely well and I took it easy since I was in my subdivision; not out on the open road.

Here is the hitch. When I slow down for a stop sign or to make a slight turn in the road, I get a light knocking sound from the rear axle. The pinion was set at 3 degrees up when we established ride height and set up the new rearend for welding. In the drive way, I can physically see the rear axle rotate VERY slightly forward and aft when I put the car in motion. This leads me to the following conclusions:

1. The 4 link bolts are a bit loose? I did not torque them excessively, but they are snug with nylon lock nuts.
2. There is play in the preload of the differential. Perhaps that nut needs torqued with a new crush washer?
3. There is excessive lash in the ring and pinion gear? The teeth looked good when I bought it, but I have no idea how to check them with a dial gauge. I do have a good shop here in town that can do this for me.
4. The driveshaft and slip yoke have excessive forward play, i.e. they cut the shaft a bit too short. This would be a real disappointment because they do great work and I do not believe this to be the case.

Any thoughts? I've tried to cover all the bases so that you have all the info you need.

Thanks!

1950 Two Door Styleline Deluxe

>> My Build Thread <<


 


acardon 
Ultra Senior Member
Posts: 11379
acardon
Loc: DFW TEXAS
Reg: 03-25-05
04-29-20 02:20 PM - Post#2792380    
    In response to 2ndtime50guy

  • Quote:
1. The 4 link bolts are a bit loose? I did not torque them excessively, but they are snug with nylon lock nuts.



If you can SEE movement, #1 is the only possibility. You would not be able to see movement from rear axle/differential problems.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
2ndtime50guy 
"4th Year" Silver Supporting Member
Posts: 1809
2ndtime50guy
Loc: Midwestern U.S.A.
Reg: 04-06-12
04-29-20 03:50 PM - Post#2792388    
    In response to acardon

Thank you Sir! That is a huge relief. I can definitely snug those down a bit more.

1950 Two Door Styleline Deluxe

>> My Build Thread <<


 
WagonCrazy 
"14th Year" Platinum Supporting Member
Posts: 3234
WagonCrazy
Loc: So Cal
Reg: 06-07-05
04-30-20 06:34 AM - Post#2792413    
    In response to 2ndtime50guy

agree with acardon. Go with the simplest things first. Get that rear end snugged up. Put a gopro camera under there and then take it out for a test drive, then go back and inspect the video.

57 Nomad -LS1 with C4 suspension
59 Apache Fleetside Shortbed BigWindow



 
2ndtime50guy 
"4th Year" Silver Supporting Member
Posts: 1809
2ndtime50guy
Loc: Midwestern U.S.A.
Reg: 04-06-12
04-30-20 10:00 AM - Post#2792429    
    In response to WagonCrazy

Thanks! I will check it out!

1950 Two Door Styleline Deluxe

>> My Build Thread <<


 


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