diff ratio change what to look out for? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

marklt · 05-19-2016, 03:44 AM

Hi there. So when I under to find source of the sledge hammer bang going on at rear.....usual problem found, trans mount bust. So while up in the air, they checked the diff as well. A bit of wear in the crown wheel / pinion. So running a 273 A4 currently.. good opportunity to change to a 342 rear. So far so good. Then I start seeing on line forums....PCM problems, shift point issues, ABS reluctor faults......really, so all this should be expected from changing the ratio?

Moreair1 · 05-19-2016, 10:42 PM

I went from 273s to 373s and never had a issue with my 02 z28, I used a handheld programmer and set the parameters with that, can't remember if it was my Diablo tuner or crane cams tuner I used

1KillerSS · 05-20-2016, 01:45 AM

All you do is change your gear ratio in your PCM settings. Done.

marklt · 05-20-2016, 04:45 AM

hi guys, ifs= there link where I can learn about the pcm programming, how to plug in, what hardware and software I will need. I suspect that there wont be any local I'm in New Zealand) programmers

1KillerSS · 05-20-2016, 06:09 AM

http://www.hptuners.com/index.php

You can buy the product there, then visit the forums for some information on how to use it.

marklt · 05-20-2016, 07:54 PM

ok, should have said, mines a 95 z28. Looks like the hp tuner option is out?

Moreair1 · 05-20-2016, 11:50 PM

Check out hypertech 30027 I believe it has the capability to change rear gear ratio

Moreair1 · 05-20-2016, 11:52 PM

Here is a link to check it out, I would shop around though seen it for less than 300.00

http://www.rickscamaros.com/camaro-p...OYrBoCD43w_wcB

05-19-2016, 03:44 AM	#1
marklt Drives: 1995 Camaro Z28 Join Date: Mar 2016 Location: Aucland Posts: 17	diff ratio change what to look out for? Hi there. So when I under to find source of the sledge hammer bang going on at rear.....usual problem found, trans mount bust. So while up in the air, they checked the diff as well. A bit of wear in the crown wheel / pinion. So running a 273 A4 currently.. good opportunity to change to a 342 rear. So far so good. Then I start seeing on line forums....PCM problems, shift point issues, ABS reluctor faults......really, so all this should be expected from changing the ratio?

05-19-2016, 10:42 PM	#2
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	I went from 273s to 373s and never had a issue with my 02 z28, I used a handheld programmer and set the parameters with that, can't remember if it was my Diablo tuner or crane cams tuner I used __________________ Cai intake and a few other mods😎

05-20-2016, 01:45 AM	#3
1KillerSS Too much is never enough! Drives: AGP TT SS [COTW] 4/20/15 Join Date: Feb 2014 Location: Toledo,OH Posts: 4,149 View My Garage	All you do is change your gear ratio in your PCM settings. Done. Attached Images __________________ AGP TT kit, 54/57 Forged rotating assembly, Custom grind cam... Dual nozzle meth, ID850's, Livernois dual fuel pumps, ECS BAP, 25% UDP, 3 inch Magnaflow catback with X pipe, Mantic 9000 clutch, DSS 1000hp axles, DSS aluminum driveshaft, ZL1 rear end, solid subframe bushings, HE differential offset bushings, BMR Trailing arm, BMR toe rods, Lingenfelter LNC-2000,SJM Line Lock. 747 whp 714wtq *Build thread* http://www.camaro5.com/forums/showth...55#post8107855

05-20-2016, 06:09 AM	#5
1KillerSS Too much is never enough! Drives: AGP TT SS [COTW] 4/20/15 Join Date: Feb 2014 Location: Toledo,OH Posts: 4,149 View My Garage	http://www.hptuners.com/index.php You can buy the product there, then visit the forums for some information on how to use it. __________________ AGP TT kit, 54/57 Forged rotating assembly, Custom grind cam... Dual nozzle meth, ID850's, Livernois dual fuel pumps, ECS BAP, 25% UDP, 3 inch Magnaflow catback with X pipe, Mantic 9000 clutch, DSS 1000hp axles, DSS aluminum driveshaft, ZL1 rear end, solid subframe bushings, HE differential offset bushings, BMR Trailing arm, BMR toe rods, Lingenfelter LNC-2000,SJM Line Lock. 747 whp 714wtq *Build thread* http://www.camaro5.com/forums/showth...55#post8107855

05-20-2016, 11:50 PM	#7
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	Check out hypertech 30027 I believe it has the capability to change rear gear ratio __________________ Cai intake and a few other mods😎

05-20-2016, 04:45 AM	#4
marklt Drives: 1995 Camaro Z28 Join Date: Mar 2016 Location: Aucland Posts: 17	hi guys, ifs= there link where I can learn about the pcm programming, how to plug in, what hardware and software I will need. I suspect that there wont be any local I'm in New Zealand) programmers

05-20-2016, 07:54 PM	#6
marklt Drives: 1995 Camaro Z28 Join Date: Mar 2016 Location: Aucland Posts: 17	ok, should have said, mines a 95 z28. Looks like the hp tuner option is out?

05-20-2016, 11:52 PM	#8
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	Here is a link to check it out, I would shop around though seen it for less than 300.00 http://www.rickscamaros.com/camaro-p...OYrBoCD43w_wcB __________________ Cai intake and a few other mods😎