Dr.Le

i noticed alot of questions surrounding before and after gear and t-lok change.

like, whats my rpm before and after
whats my mpg before and after
power before and after
... and so on.

I love that ppl w/ the gear change chime in and answers but its alot of retrospective answers, meaning its "well i remember..." this translates to more inaccuracies. (memories can be colored and blurred w/ time).

so here i am, fresh and excited about gear change... feel free to ask questions...

rpm.... 1900 @65mph
2300 @75mph

mpg.... pretty awful, 21-22hwy; 16-17 street (lead foot driving)

noise... cabin is okay, i can still talk w/ passenger at normal volume on highway, even w/ true dual h-pipe flow.

what else guys? i wanna contribute.

Fink

im guessing your an auto since your rpms are 1900 @ 65. Your trans is an important piece to mention when talking about gears. since a 5 speed manual will rev lower than a 4 speed auto at the same mph.

Dr.Le

yup, its a jmoded auto.

Haha, i figured saying 4.10s ppl know its for autos... but you're right, tranny is very important to mention...

i welcome more questions.

mustang99v6

No questions, but just an opinion. I wish I would have went 4.30 instead of 4.10 on mine. Same set up, auto, j-mod, except I have an aluminum driveshaft. I mean sure, if you do highway driving or road trips, then 4.10 is enough. But, for me, having my in town playtoy, 4.10 just doesn't give enough oomph. So, the common opinion of 3.73 for manual, 4.10 for auto, is for casual. But, for more serious, I would go 4.10 manual, 4.30 auto.

Fink

Ill never go higher than 3.55's and Im an auto.. weeeeelllllll, i should bite my tongue until i see what 1st gear is like with the M112.

mustangman02232

you cant get 3.90/4.30s for the 7.5 only the 8.8

mustangmike09

auto
3.73s

70mph is like 2300ish rpm I think.

HCI built 4.2

16ish C 20ish H

slonison

That's the avatar I've been missing Fink... FYI to all, Fink looks bad *** like that irl.

Dr.Le

yeah, that sounds like lots of fun too. i wonder what traction would be like. gonna need some super wide tires....

mustangman02232 states that we 7.5 diff can't get 3.90/4.30 cuz there on 8.8 only. hmmmmm i wonder why? they dont produce w/ those specs maybe...

but i think 4.30 might be unstable to the small 7.5? anyways, dont wanna go off topic.