rednose RNS10S Donating Members 2,229 Member For: 18y 4m 10d Gender: Male Posted 13/04/12 01:18 PM Share Posted 13/04/12 01:18 PM Thanks for the repliesHow do I check the diff gears? I'm sure it's the standard gearbox as it was originally a cop car and I know they are auto.There should be a sticker on the diff centre. 1 Link to comment Share on other sites More sharing options...
Vevapower Waiting for the 1st N/A 12! Donating Members 2,533 Member For: 16y 10m 15d Gender: Male Location: Sydney Posted 13/04/12 01:19 PM Share Posted 13/04/12 01:19 PM (edited) To check diff gear, jack car up make a mark on tailshaft and dead bottom center of either wheel and rotate wheel and count how many times the wheel goes around before the tail shaft mark is back to the orignal start point! if it has 2.73's then the wheel wont quite of made 3 turns. You get picture 4.11;s 4 turns! Edited 13/04/12 01:21 PM by Vevapower Link to comment Share on other sites More sharing options...
rednose RNS10S Donating Members 2,229 Member For: 18y 4m 10d Gender: Male Posted 13/04/12 01:22 PM Share Posted 13/04/12 01:22 PM I think I read somewhere that cop cars had different diff gears - dont hold me to that though.Mine is an ex highway and it still has the standard diff ratios. Link to comment Share on other sites More sharing options...
Ciaran Thooperrrrrrr Donating Members 2,768 Member For: 13y 5m 24d Gender: Male Location: NOR, Western Australia Posted 13/04/12 01:24 PM Share Posted 13/04/12 01:24 PM Ah, well disregard what I said about that then (lucky I had my "disclaimer" haha) Link to comment Share on other sites More sharing options...
rednose RNS10S Donating Members 2,229 Member For: 18y 4m 10d Gender: Male Posted 13/04/12 01:31 PM Share Posted 13/04/12 01:31 PM Ah, well disregard what I said about that then (lucky I had my "disclaimer" haha)All good mate, the only extra you get with cop cars in the bf range is slotted discs and extra holes in your interior. The diff gear issue affected me with my BA 3V, when I changed from 3.23 to 3.73 and had it in perf mode it would hit the limiter before changing up a gear, I just got used to driving it in man mode until I flashed it, then it was fine. 1 Link to comment Share on other sites More sharing options...
knoles Donating Members 390 Member For: 13y 9m 10d Gender: Male Location: Port Hedland Posted 13/04/12 01:35 PM Share Posted 13/04/12 01:35 PM (edited) To check if diff gears have been changed without updating the computer you could just drive next to a car at a certain speed and see if speedos read the same I think. Even if they've been changed im pretty sure wheel speed is read off the rear of the trans which would just throw out speedo and not much else? Im not certain though.EDIT: just read the post above about the diff gears and that proves that it may be the cause? Edited 13/04/12 01:37 PM by knoles Link to comment Share on other sites More sharing options...
1600dave Donating Members 872 Member For: 13y 11m 17d Posted 13/04/12 10:42 PM Share Posted 13/04/12 10:42 PM Take it to a tuner that's familiar with them, someone off here should be able to help, where are you located?Banging on the limiter won't help your oil pump gears, and the rear end bang could be stuffed diff bushes (even though mine still gives a decent thud when lifting off under heavy load and they're fine)Bit unusual for an otherwise stock car to have had the diff/gears changed, unless its been fiddled with then returned to stock to sell. Link to comment Share on other sites More sharing options...
nathos Member 26 Member For: 14y 10m 20d Posted 18/04/12 12:58 PM Author Share Posted 18/04/12 12:58 PM im located in the s.e suburbs of melbreset the ecu by disconnecting the batterynow it will change on wot from 1st to 2nd but 2nd to 3rd under wot it hits the limiter and sits there...it feels like the car is driving better though after reseting the box Link to comment Share on other sites More sharing options...
LEEXR6T Donating Members 91 Member For: 19y 8m 13d Gender: Male Posted 19/04/12 02:26 AM Share Posted 19/04/12 02:26 AM Cat converter possibly starting to collapse? Link to comment Share on other sites More sharing options...
nathos Member 26 Member For: 14y 10m 20d Posted 19/04/12 02:56 AM Author Share Posted 19/04/12 02:56 AM How would the cat cause that to happen? Link to comment Share on other sites More sharing options...
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