Team Chevelle banner
  • Hey everyone! Enter your ride HERE to be a part May's Ride of the Month Challenge!

1 - 11 of 11 Posts

·
Registered
Joined
·
113 Posts
Discussion Starter · #1 ·
Hey Guys,

I'm still working the bugs out of my fresh partial restoration... I have a 12 bolt rear with a 4.10 that I freshened-up with new moser axles, new axle bearings, new boxed lowers, new sway bar and all new rubber bushings.

The rear does have the frame support braces and I torqued everything at ride height. I think I made the mistake of re-using the stock upper control arms because when I poked the throttle on the new Mark Jones 467 in second gear the wheels broke loose with wheel hop.

I ordered a magnetic angle finder to check things and get within the proper range. I'm considering the Spohn Performance adjustable rear uppers. Has anyone used these or would you recommend another brand?

Thanks in advance!
 

·
Registered
Joined
·
829 Posts
Hey Guys,

I'm still working the bugs out of my fresh partial restoration... I have a 12 bolt rear with a 4.10 that I freshened-up with new moser axles, new axle bearings, new boxed lowers, new sway bar and all new rubber bushings.

The rear does have the frame support braces and I torqued everything at ride height. I think I made the mistake of re-using the stock upper control arms because when I poked the throttle on the new Mark Jones 467 in second gear the wheels broke loose with wheel hop.

I ordered a magnetic angle finder to check things and get within the proper range. I'm considering the Spohn Performance adjustable rear uppers. Has anyone used these or would you recommend another brand?

Thanks in advance!
On mine I went with UMI uppers and lowers with full Roto joints, rear end housing I used spherical bearings(the poly shattered less then 1500 miles) I’m using the Spohn pro touring adjustable sway bar. Ride tech coil overs. I built a shock tower tie bar with chrome moly tubing. I wouldn’t do anything different on mine it’s super smooth and don’t notice any road noise..because my car is loud
 

·
Registered
Joined
·
5,978 Posts
Had Wheel Hop before buying these UMI Perf parts Home - UMI Performance Inc.
and I found them to be of the best looking & quality that I have ever seen/used;
1. UMI Perf 64-67 GM A Body Rear Lower Boxed / Adj Upper Control Arms # 402126
2. UMI Perf 64-72 GM A Body Solid Front and Rear Sway Bar Kit # 403534
3. UMI Perf 64-72 GM A-Body Tubular Upper & Lower Front A-Arm Kit # 403133
4. UMI Perf 64-72 GM A-Body Viking Front Coil Over, Dbl Adj Shocks # A205-550T
5. UMI Perf 64-72 GM A-Body Viking Rear Dbl Adj Shocks # B220
6. UMI Perf 64-72 GM A-Body Tie Rod Adjusters # 2103
7. UMI Perf 64-67 GM A-Body Rear Shock Tower Brace # 4059
Also I added the Rear Frame Cross Brackets/Control Arm Reinforcements.

The difference in ride quality/handling , went to firm and stable,
that I have acquired with the great parts from UMI Perf I put on from the previous original type Springs
and Shocks ride which was like riding on a log road,
so it has been a night to day type change in ride and handling response .

If you only want Rear Upper Control Arms, then a Set of one of these is where you should be looking at
Upper Rear Control Arms Archives - UMI Performance Inc.
I got the # 402500 in the Combo Kit I bought
After putting the Adj Uppers and Boxed Lowers on my 67 I never have had any Wheel Hop

PLUS add this to your Rear Suspension even if not going Rear Coil Overs,
as it will Stableize/Stiffen/Strengthen the Back Upper Cross Frame
1968-1972 GM A-Body Rear Shock Tower Brace, Bolt In - UMI Performance Inc.

710874


710875

710876
 

·
Premium Member
1970 El Camino SS396, VortecPro 467, ATI TH400, Moser 12 bolt /TruTrac 3:42, Hedman headers
Joined
·
779 Posts
I have Spohn lowers and adjustable uppers in my El Camino but with a full 12 bolt Moser (relocated upper attachments) rear, take your time putting in the uppers when you adjust them for length, the magnetic angle finder/ digital protractor is the way to go. You may want to ACCURATELY measure the distance between the front and rear wheels (wheelbase) on BOTH sides to make sure your chassis is “square” before you install the uppers, FWIW.
 

·
Registered
Joined
·
113 Posts
Discussion Starter · #6 ·
Thanks Guys for all your information.... If you don't mind, I'll post my engine, tail shaft and pinion angles once I get the angle finder. Is there a calculated pinion angle to achieve in order to eliminate wheel-hop?
 

·
Registered
Joined
·
5,978 Posts
There are many things that contribute to Wheel Hop
1. Back of Car to High / so if the Rear Height of Car is too High it will result in Wheel Hop
2. Worn out Bushings in the Rear Control Arms/Axle Housing
3. Worn out Coil Springs / need good Stiff ones
4. Hard Tires will Bounce back off of the Pavement when 1.2.3. are applicable
5. Rubber Air Bags in the Coil Springs Help Hard Launches
6. Good Shocks set to Force the Tire Downward into the Pavement
7. Better than Stock Rear Control Arms are a must IMO / that is why I had Wheel Hop with the 468 ci
8. Pinion Angle also can contribute but also can cause other problems too

Here is a Search of how guys on TC Fixed their Wheel Hop problems
Search results for query: Wheel Hop

You must find out what BOTH of your Pinion Angles are
A) the one at the Trans and B) the one at the Rearend
they should be Equal but opposite
and in a Coil Spring Car the Rear Pinion Angle should be Downward some
as the Rearend will Rotate Upwards when Power is put to it
Search results for query: Pinion Angles
 

·
Registered
Joined
·
829 Posts
Thanks Guys for all your information.... If you don't mind, I'll post my engine, tail shaft and pinion angles once I get the angle finder. Is there a calculated pinion angle to achieve in order to eliminate wheel-hop?
Get the lower control arms level with the pavement. You shouldn’t have any wheel hop then.
 

·
Premium Member
69 Chevelle 502 Big Block, TH400, 4:11 posi
Joined
·
354 Posts
TREMEC toolbox app. Download to your phone
 
  • Like
Reactions: Jakes_69Chevelle

·
Registered
Joined
·
113 Posts
Discussion Starter · #11 ·
There are many things that contribute to Wheel Hop
1. Back of Car to High / so if the Rear Height of Car is too High it will result in Wheel Hop
2. Worn out Bushings in the Rear Control Arms/Axle Housing
3. Worn out Coil Springs / need good Stiff ones
4. Hard Tires will Bounce back off of the Pavement when 1.2.3. are applicable
5. Rubber Air Bags in the Coil Springs Help Hard Launches
6. Good Shocks set to Force the Tire Downward into the Pavement
7. Better than Stock Rear Control Arms are a must IMO / that is why I had Wheel Hop with the 468 ci
8. Pinion Angle also can contribute but also can cause other problems too

Here is a Search of how guys on TC Fixed their Wheel Hop problems
Search results for query: Wheel Hop

You must find out what BOTH of your Pinion Angles are
A) the one at the Trans and B) the one at the Rearend
they should be Equal but opposite
and in a Coil Spring Car the Rear Pinion Angle should be Downward some
as the Rearend will Rotate Upwards when Power is put to it
Search results for query: Pinion Angles
There are many things that contribute to Wheel Hop
1. Back of Car to High / so if the Rear Height of Car is too High it will result in Wheel Hop
2. Worn out Bushings in the Rear Control Arms/Axle Housing
3. Worn out Coil Springs / need good Stiff ones
4. Hard Tires will Bounce back off of the Pavement when 1.2.3. are applicable
5. Rubber Air Bags in the Coil Springs Help Hard Launches
6. Good Shocks set to Force the Tire Downward into the Pavement
7. Better than Stock Rear Control Arms are a must IMO / that is why I had Wheel Hop with the 468 ci
8. Pinion Angle also can contribute but also can cause other problems too

Here is a Search of how guys on TC Fixed their Wheel Hop problems
Search results for query: Wheel Hop

You must find out what BOTH of your Pinion Angles are
A) the one at the Trans and B) the one at the Rearend
they should be Equal but opposite
and in a Coil Spring Car the Rear Pinion Angle should be Downward some
as the Rearend will Rotate Upwards when Power is put to it
Search results for query: Pinion Angles
Kirk - thanks for putting this all together, it's very helpful!

My angle finder is on it's way, I'm curious as to the angles. I'm at stock height, 14 inch stock rims, all new suspension part and bushings. I had the wheel-hop problem prior to rebuild so it could be the angle.

Thanks again!
 
1 - 11 of 11 Posts
Top