I found a good deal on a 4.10 posi rear end. ($150) My only question is, will a 4.10 be too stiff for the street? Im running a t-5 and I figured that with 16'' wheels in 5th gear at 70mph I will be at about 3000 revs. Anyone want to double check me? Ideas???

 

Yea that sounds about right, I`ve got 4.10`s and a 700r4 with a 3000, 9inch....about 3000rpm`s at 65mph with 26" tires. I think I`d go 3.73 next time around. I belive the od in the auto is .70 under. The first is 3.06, seems too whinedy in first, cant tell if it is accelrating or spinning or slipping sometimes.

http://www.cardomain.com/memberpage/487725

 

Mmmm... not great. However, a good deal is sometimes worth a small sacrifice. 3.73s would be ideal, but the 4.10s are street manageable with a five speed.

 

4.10s are streetable with a t5. 4.10s are pretty much impossible to hook up on the street. my rpm's are a little lower, about 2500rpm at 75mph. since they are so hard to hook on the street, that i am planning on 3.73's. but when the 4.10's hook at the track, they really make the car come alive!!

if its a daily driver, i would say no, but if its just a cruiser they really are a nice gear

 

Based on the information listed in your signature I would say 4.10s will be too much for a daily driver. The T5 most likely has a 3.27:1 1st gear, so 1st will be very short. The highway RPMs will put a lot of unecessary stress on you engine. I'd go with 3.42s or maybe 3.73s. If you had a T56 I'd say definately go with the 3.73s, but with the T5 your RPMs at highway speed will still be fairly high with the 3.73s. My 2 cents.

 

2.95



I personally wouldn't run 4.11 or 4.10 gears on the street w/ a T5 because I like comfortable highway speeds. Then again, the T5 with 4.11s is no worse than a 700-R4 with 3.73s as far as hwy rpm, and that's what's in my 87 (700 /3.73.)

.70 * 3.73 = 2.611 final drive

4.11 * .62 = 2.5482 final drive

 

That's right Fords use the 3.27 1st gear, as do Tremec 3550s.

A 2.95:1 1st gear wouldn't be so bad in 1st gear, but your highway RPM will still be too high IMO.

 

I've got 4.10's on 16" rims, and at 2500 rpms I'm doin 75 mph. Not bad, and I even use the car for delivering pizza's.....

 

I believe most t5's came with a .7x 5th gear. Wasn't the .6x much more rare for some reason?

 

i have them in my 85 ta. and so does my dad in his 77 ta. i love them , i dont drive the car very much so it doesnt bother me, and then farthest i drive the car is to lebanon valley to drag race . But we both love 4.10.

 

go for it,when that 5-spd breaks get a 6-spd..perfect

 

Not for f-body V8 T5s. If you're talking 4 and 6 cylinder T5's, possibly; I never paid much attention to the 4 / 6 cyl. ratios.

But a long time ago, there was a comprehensive list on here somewhere of each year and the T5 build #'s. Most of the V8 boxes are the .6x fifth gear.

Also, I had an 84 L69 trans am T5; had the .62 fifth. I had an 88 TBI f-body T5; had the .62 fifth.

 

I know the tbi cars got the .6xx 5th gear and the tpi cars got the .7xx 5th gear.

 

A suggestion: Don't state absolutes which are not absolute.

13-52-182 mean anything to you?

 

Transmission Engine code 1st 2nd 3rd 4th 5th
1982 TH-200C All 2.74 1.57 1.00

1982 4-sp Muncie LQ8/LQ9 3.50 2.48 1.66 1.00
LC1 3.60 2.48 1.66 1.00
LG4 3.42 2.28 1.45 1.00
LU5 2.88 1.91 1.33 1.00

1983 TH-200C LQ8/LQ9 2.74 1.57 1.00
LC1 2.74 1.57 1.00

1983 TH-700R4 All 3.06 1.63 1.00 .70

1983 4-sp Muncie LQ8/LQ9 3.50 2.48 1.66 1.00

1983 5-sp Warner Gear LQ8/LQ9 3.50 2.14 1.36 1.00 .73
LC1 3.50 2.14 1.36 1.00 .73
LG4 2.95 1.94 1.34 1.00 .73

1984 TH-700R4 LQ9 3.06 1.63 1.00 .70
LC1 3.06 1.63 1.00 .70
LG4 3.06 1.63 1.00 .70
L69-HO 3.06 1.63 1.00 .70

1984 4-sp Muncie LQ9 3.50 2.48 1.66 1.00

1984 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .72
LC1 3.50 2.14 1.39 1.00 .78
LG4 2.95 1.94 1.34 1.00 .73
L69-HO 2.95 1.94 1.34 1.00 .73

1985 TH-700R4 ALL 3.06 1.63 1.00 .70

1985 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .72
LB8 4.03 2.37 1.50 1.00 .76
LG4 2.95 1.94 1.34 1.00 .63
L69-HO 2.95 1.94 1.34 1.00 .63

1986 TH-700R4 ALL 3.06 1.63 1.00 .70

1986 5-sp Warner Gear LQ9 3.76 2.18 1.42 1.00 .86
LB8 3.50 2.14 1.36 1.00 .78
LG4 2.95 1.94 1.34 1.00 .63
LG4 3.35 1.93 1.29 1.00 .63
L69-HO 2.95 1.94 1.34 1.00 .63
L69-HO 3.35 1.93 1.29 1.00 .61

1987 TH-700R4 ALL 3.06 1.63 1.00 .70

1987 5-sp Warner Gear LB8 4.03 2.37 1.50 1.00 .76
LG4 2.95 1.94 1.34 1.00 .63
LB9 2.95 1.94 1.34 1.00 .63
LB9 2.95 1.94 1.34 1.00 .73

1988 TH-700R4 ALL 3.06 1.63 1.00 .70

1988 5-sp Warner Gear LB8 4.03 2.37 1.50 1.00 .76
LO3 2.95 1.94 1.34 1.00 .63
LB9 2.95 1.94 1.34 1.00 .73



1989-92 World Class T5 LB8 4.03 2.37 1.50 1.00 .76


LO3 2.95 1.94 1.34 1.00 .63

LB9 2.75 1.94 1.34 1.00 .74

4L60-E 3.06 1.62 1.00 .70

 

Like I said, they didn't even make tbi f body's until 1988 and they ran though 1992. Thus, in those years the tbi t5's got the .6xx overdrive and the tpi t 5's got the .7xx overdrive. I believe the tpi cars had the .6xx overdrive until gm changed it to a .7xx 5th gear so the 1LE cars could be more competitive. As for the #'s, they don't come to mind.

 

1352-182
1352-176
1352-196
and 1352-213 actually.

Those are all T5's which saw use w/ the LB9, all are 2.95 / .63 T5s.

Now, did you read what I said about absolutes?

 

read my above post.

 

Try wording things correctly and posting correct information, then your posts will be worth reading. Now, a review for the confused:


And I answered this in relation to the V8 T5s. No, it's not rarer.


& not all TPI cars got the .74 fifth, so this is wrong.


Great. A bunch of gear ratios based on supposition. I provided you with service #'s to T5's that were put behind LB9 engines and have the ratios you claim weren't used behind TPI 5.0L engines.


When did you say this? And what does it have to do with anything except being something that we all already know?


In relation to 1988-1992, you're still wrong.


I believe you pulled that out of your ****. Yes, I would believe 1LE cars would have and could have come with the ratios you believe.

The issue at hand is that you stated absolutely that TPI cars got the .74 overdrive. It's simply not true. Some did, some did not and got the .63. The service #'s I posted speak for themselves.

 

Excuse me for wording it wrong and not clarifying EXACTLY down to the t what I meant. Any time someone disagrees with you or tries to correct you or even has a question you respond with very rude comments. Use some common sense. When comparing tbi to tpi cars I would have to mean 88-92 because those are the only years the 2 were produced together in the f body. You have not provided me with any information to prove me wrong either. Also, contrary to your belief, I did not pull the 1LE FACT out of my ***. If you do not believe me do a little research. Perhaps maybe go to a website completely dedicated to 1LE cars. That is where I learned my information about 2 years ago. I realize now that I must clarify that through the years 1988-1992 the L03, aka 305 tbi, cars recieved a t5 with a .6x overdrive, and the LB9, aka 305 tpi, recieved a .7x overdrive ratio. The tpi t5's recieved this ratio in order to help the 1LE cars pull down the straights better in competition.

EDIT: on the common sense issue, why would I would post a complete list showing LB9's with a .6xx ratio when to you I am trying to prove that none came with them?

 

t-5 89 1989-92 World Class T5 LB8 4.03 2.37 1.50 1.00 .76
good idea?