Rear Drops when Put in Drive

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May 4, 2015 | 08:05 PM

jokerman2k

Thread Starter

Instructor

Joined: May 2006

Posts: 211

Likes: 4

From: Taunton MA

Rear Drops when Put in Drive

Just got this 79 Vette after having an 84. It's an automatic. When I put it in Drive the rear end drops. Kind of cool feels like it's about to jump but I know it's not normal to do that.

Shocks, tranny mount, not sure. Any ideas? Anyone had this happen before where the back end drops when you put it in drive?

Thanks,

May 4, 2015 | 08:11 PM

bobbarry

Burning Brakes

Joined: May 2009

Posts: 850

Likes: 36

From: Providence RI

My '71 does the same. Not a lot, but noticeable.

May 4, 2015 | 08:23 PM

'75

Le Mans Master

Joined: Dec 2007

Posts: 6,422

Likes: 591

From: McHenry Illinois

That's normal, every C3 I've been in does it.

May 4, 2015 | 08:47 PM

doorgunner

2026 Loser of the Year

Joined: Sep 2013

Posts: 36,607

Likes: 7,053

From: New Or-leens Loo-z-anna

My '68 project would drop about 1&1/2" when put in Drive. I replaced the longest leaf on the springpack and installed new shocks.......

now it only drops about 1/2" when I put it in Drive....when I romp on it, it drops half as much as it previously did.....the front end raises about 2 inches.

It now has the same feel as my '69 Camaro which had traction bars.

May 4, 2015 | 10:10 PM

Jartanyon

Racer

Joined: May 2013

Posts: 421

Likes: 6

From: Chicago IL

Quote:

that's normal, every c3 i've been in does it.

+ 1.

May 4, 2015 | 10:31 PM

Tom73

Race Director

Joined: Apr 1999

Posts: 15,154

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From: NM

Quote:

Originally Posted by '75

That's normal, every C3 I've been in does it.

Just a fact of life with IRS. Driveshaft pulls the differential down as the pinion gear tries to climb the ring gear.

May 4, 2015 | 11:22 PM

gjohnson

Drifting

Joined: Mar 2008

Posts: 1,810

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From: Denver CO

Normal

May 4, 2015 | 11:42 PM

qwank

Le Mans Master

Joined: Feb 2011

Posts: 5,943

Likes: 61

From: Southern NH

If the front snubber bushing is worn out the drop might be excessive

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May 5, 2015 | 06:34 AM

Bad Bird

Racer

Joined: May 2011

Posts: 484

Likes: 10

From: Newcastle NSW

Yeah, just an IRS thing. Every car I've owned that had IRS did this. I think that it's pretty cool actually.

May 5, 2015 | 07:09 AM

#10

Easy Mike

Team Owner

Joined: Jun 2000

Posts: 38,923

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From: Southbound

Cruise-In II Veteran

Posi-traction.

May 5, 2015 | 01:40 PM

#11

PRNDL

Team Owner

Joined: Jul 1999

Posts: 26,545

Likes: 46

From: Huntersville NC

"squat"

https://www.corvetteforum.com/forums...rchid=47059312

May 5, 2015 | 02:11 PM

#12

sstopczy

Racer

Joined: Jul 2009

Posts: 338

Likes: 9

From: South Bend IN

NCM Sinkhole Donor

Quote:

Originally Posted by qwank

If the front snubber bushing is worn out the drop might be excessive

I agree. Check the condition of this bushing, mine was shot. Squat greatly improved with this. http://www.parts123.com/corvettecent...50g&ukey=11791

May 6, 2015 | 10:51 AM

#13

jokerman2k

Thread Starter

Instructor

Joined: May 2006

Posts: 211

Likes: 4

From: Taunton MA

Looks like if it's normal I'm good with it. Like i said feels cool like it's getting ready to jump. Now that i know it's normal (to a point).
Thanks

May 7, 2015 | 12:41 PM

#14

widowmaker221

Instructor

Joined: Nov 2013

Posts: 220

Likes: 17

From: Pasadena MD

Quote:

Originally Posted by jokerman2k

This same thing freaked me out last year when I first got my car too.I hadn't even thought about it this Spring until this thread. I also believe it is due to the IRS so it's normal.

May 7, 2015 | 03:39 PM

#15

Capkunu

Pro

Joined: Oct 2013

Posts: 557

Likes: 3

From: El Sobrante CA

If you don't find yourself sitting on the pavement, all is well.

May 7, 2015 | 08:45 PM

#16

kdf1986

Safety Car

Joined: Jun 2004

Posts: 4,652

Likes: 80

From: Lakeland Florida

Mine does the same thing. Something I look forward to because it has been a feeling I get from owning my first Vette back in 1981, and every automatic since then.

kdf

May 8, 2015 | 06:35 AM

#17

bkvette3

Safety Car

Joined: Jul 2009

Posts: 3,719

Likes: 95

From: Saskatchewan, Canada

Love the feeling.

Ready to pounce.

May 8, 2015 | 08:58 AM

#18

HOOAH

1969/1971/2021 Coupes

Joined: Jan 2008

Posts: 2,212

Likes: 80

From: Port Huron MI

St. Jude Donor '09-'10-'11-'12-'13-'14-'15

Quote:

Originally Posted by sstopczy

I agree. Check the condition of this bushing, mine was shot. Squat greatly improved with this. http://www.parts123.com/corvettecent...50g&ukey=11791

Agree especially if you start hearing a clunk when putting them in gear or letting out the clutch. most automatically think rear end issues but more times than not, it's the bushing wearing/wore out.

Terry