shifter bobbing up and down on accel - ZR-1 Net Registry Forums

LGAFF · 07-22-2012

Going to recheck the C-beam bolts, but under hard accel the shifter is moving up about 1/2" maybe more....any other possibilities? This is on the 90...pretty confident I torqued to 37 and 59

XfireZ51 · 07-22-2012

Quote:

Originally Posted by LGAFF

Going to recheck the C-beam bolts, but under hard accel the shifter is moving up about 1/2" maybe more....any other possibilities? This is on the 90...pretty confident I torqued to 37 and 59

Does it have the Beam plates?

VetteMed · 07-22-2012

Lee, I had the same problem when I didn't completely clean the mating surfaces of the C-beam and of the transmission and differential. The bolts were torqued properly, but a few bits of the OEM adhesive were preventing flush fitment.

Of course, a worn or broken motor mount or batwing mount can do the same thing. But, if you've had the c-beam off recently, I'd want to check that there's no adhesive or debris preventing proper mating.

scottfab · 07-22-2012

Quote:

Originally Posted by LGAFF

Going to recheck the C-beam bolts, but under hard accel the shifter is moving up about 1/2" maybe more....any other possibilities? This is on the 90...pretty confident I torqued to 37 and 59

Yah, re-tighten bolts but check trans cross member and motor mounts too.

Paul Workman · 07-22-2012

Quote:

Originally Posted by scottfab

Yah, re-tighten bolts but check trans cross member and motor mounts too.

No trans "cross member" on a ZR-1 (ZF) transmission. That leaves motor mounts, C-beam joints, and the "bat wing" bushings on the differential. Ya have ta go back to C3s to come across cross members for the trans.

P.

LGAFF · 07-22-2012

Loos beam bolts.....surprised as my torque wrench was still set for them, and I used the 02 wrench to tighten...hopefully problem solved

did manage to take a nice 21MM deep socket to the eye

-=Jeff=- · 07-23-2012

Quote:

Originally Posted by LGAFF

Loos beam bolts.....surprised as my torque wrench was still set for them, and I used the 02 wrench to tighten...hopefully problem solved

did manage to take a nice 21MM deep socket to the eye

you leave your torque wrench set? I always Zero it out after use..

but yeah not surprised the bolts were loose

scottfab · 07-23-2012

Quote:

Originally Posted by -=Jeff=-

you leave your torque wrench set? I always Zero it out after use..

but yeah not surprised the bolts were loose

I loosen it also. Leaving it set is suppose to negatively effect the accuracy.

scottfab · 07-22-2012

Quote:

Originally Posted by Paul Workman

No trans "cross member" on a ZR-1 (ZF) transmission. That leaves motor mounts, C-beam joints, and the "bat wing" bushings on the differential. Ya have ta go back to C3s to come across cross members for the trans.

P.

Yup and my C3 had one. Brain fade. It's all that bike riding and fresh air. Well that and I haven't had to do anything under there since I rebuilt my ZF6.

rhipsher · 07-22-2012

Lol! I took a Spicer Ujoint cap to the fore head while installing. I bled like a siv.

07-22-2012	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	shifter bobbing up and down on accel Going to recheck the C-beam bolts, but under hard accel the shifter is moving up about 1/2" maybe more....any other possibilities? This is on the 90...pretty confident I torqued to 37 and 59 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-22-2012	#3
VetteMed Join Date: Mar 2009 Location: Orlando, FL Posts: 1,828	Re: shifter bobbing up and down on accel Lee, I had the same problem when I didn't completely clean the mating surfaces of the C-beam and of the transmission and differential. The bolts were torqued properly, but a few bits of the OEM adhesive were preventing flush fitment. Of course, a worn or broken motor mount or batwing mount can do the same thing. But, if you've had the c-beam off recently, I'd want to check that there's no adhesive or debris preventing proper mating. __________________ 2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold)

07-22-2012	#6
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: shifter bobbing up and down on accel Loos beam bolts.....surprised as my torque wrench was still set for them, and I used the 02 wrench to tighten...hopefully problem solved did manage to take a nice 21MM deep socket to the eye __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

07-22-2012	#10
rhipsher Join Date: Aug 2008 Location: Houston 90 Red ZR-1 Posts: 2,320	Re: shifter bobbing up and down on accel Lol! I took a Spicer Ujoint cap to the fore head while installing. I bled like a siv.