• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech

What is your opinion? 3.80 or 4.10 8" rear

  • Thread starter Thread starter bryanvw61
  • Start date Start date Jun 10, 2008
Prev
  • 1
  • 2
First Prev 2 of 2
B

bryanvw61

New Member
May 15, 2008
17
0
0
CT
Jun 19, 2008
#21
  • Jun 19, 2008
  • #21
what is this wide ratio you speak of?

My T-5 is a motorsports 2.95 box with 1.94 1.26 1 and .63
 

ratio411

Founding Member
Apr 21, 2002
3,870
73
109
Pensacola FL
Jun 19, 2008
#22
  • Jun 19, 2008
  • #22
bryanvw61 said:
My T-5 is a motorsports 2.95 box with 1.94 1.26 1 and .63
Click to expand...

Well heck... one of the previous posters said your 1st gear was 3.35.
I guess they were mistaken!

Well the 2.95 changes things.
I stand on my 3.80 opinion again.
That gives you 11.21 in first gear.
Not bad at all.

The wide ratio Toploader is only the most kick@ss tranny to come out
of Detroit during the time our cars were built.

2.78-1.93-1.36-1.00 is the gear spread.

Your tranny looks to have a very nice gear spread.
Maybe "close ratio" in T5 speak means something different than "close ratio"
in Toploader speak.
I can't stand 5 speeds that have a granny low in the 3s, and then have 2nd
gear fall flat on it's face in comparison.
 
B

bryanvw61

New Member
May 15, 2008
17
0
0
CT
Jun 19, 2008
#23
  • Jun 19, 2008
  • #23
I would say close ratio was used differently...lol

anyways i did order a set of 4.11s and this is why...

my 1998 Jetta GT has the sweetest gear ratios and just loves to pull, so to settle the vote of 3.80 or 4.11 (I know my 4.10 was incorrect) i popped all the numbers in a gear ratio calc and wah la, the 4.11 combo was very similar to the jetta numbers, so i let that be the deciding vote.

this motor will probably wind up fast, but what the hey, if I don't like the 4.11, it'll be an excuse to rip it apart again and put a little trac-lock in it with 3.80s
 

ultrastang

Founding Member
Feb 26, 2002
1,092
2
37
Arkansas
www.ultrastang.com
Jun 19, 2008
#24
  • Jun 19, 2008
  • #24
"Back in the day," the early Mustangs with a Top-Loader 4-speed came with a 2.78 1st gear.

In the Mustangs like the Boss 302s (designed for Trans Am [road] racing), they came with close ratio Top-Loader 4-speeds with a 2.32:1 1st gear.


The 5.0L LX/GT Mustangs came with T-5s that had a 3.35:1 1st gear ratio. The Mustangs like the '93 Cobras used the "Z-spec" T-5s with a 2.95:1 1st gear.

To determine your torque multiplication ratio, multiply your transmission's 1st gear ratio by the rear end ratio. Example: Z-spec T-5 1st gear's 2.95 x rear end ratio of 4.11:1 = 12.12:1
http://ultrastang.com/Page.asp?PageID=9

To determine final drive ratio, multiply your transmission's high gear ratio (or overdrive ratio) by the rear end's ratio. Example: Z-spec T-5 5th gear's .62 x 4.11 rear ratio = 2.55:1 final drive.
http://ultrastang.com/Page.asp?PageID=8


This is what happens to your engine's RPMs with and without an overdrive:
http://ultrastang.com/Page.asp?PageID=8
 

Fast63

New Member
Sep 20, 2007
717
0
0
Jun 19, 2008
#25
  • Jun 19, 2008
  • #25
ratio411 said:
The wide ratio Toploader is only the most kick@ss tranny to come out
of Detroit during the time our cars were built.

2.78-1.93-1.36-1.00 is the gear spread.
Click to expand...

Dude, you're talkin my language. It doesn't get any better than a wide ratio toploader gear set.....
 

ultrastang

Founding Member
Feb 26, 2002
1,092
2
37
Arkansas
www.ultrastang.com
Jun 20, 2008
#26
  • Jun 20, 2008
  • #26
Fast63 said:
Dude, you're talkin my language. It doesn't get any better than a wide ratio toploader gear set.....
Click to expand...

I don't know. I have an old (wide ratio) Top-loader 4-speed that used to be in my '68 when the '68 was my daily driver (1982-1989). Granted, It's a tough transmission and all, but it's not pleasant with low rear end gears and cruising out on the highway due to the high engine RPMs it induces. The whole experience is much better with an overdrive if your vehicle is street/highway driven. The overdrive gives you the best of both worlds with being able to run low rear end gears and also be able to keep the engine revs low at speed.

Unless I was to build a track-only car, I seriously doubt I would ever use my Top-Loader again.
 
Prev
  • 1
  • 2
First Prev 2 of 2
You must log in or register to reply here.

Similar threads

C
Suggestions for rear diff gears - 1969 Mach 351W 4v
  • cfauvel
  • Apr 8, 2024
  • Classic Mustang Specific Tech
Replies
10
Views
2K
Classic Mustang Specific Tech Jun 27, 2024
cfauvel
C
E
For Sale 1989 LX Notch 410ci 85mm turbo 8 pt cage 9" rear end
  • EightyNineFive
  • Aug 22, 2021
  • Fox Body Mustangs For Sale (1979-93)
Replies
1
Views
4K
Fox Body Mustangs For Sale (1979-93) Jun 18, 2022
Freakinstang
F
Drivetrain 78 Ii 8" 3.80???
  • 78mIIman
  • Nov 16, 2017
  • 1974 - 1978 Mustang II Talk & Tech
Replies
8
Views
2K
1974 - 1978 Mustang II Talk & Tech Nov 27, 2017
LILCBRA
M
For Sale FS: 2000 Mustang GT Track Car / 62k Miles / 5k on Motor / Full Roll Cage / California / $5,000 OBO
  • McSmash
  • Jun 8, 2020
  • SN95 Mustangs For Sale (1994-04)
Replies
0
Views
5K
SN95 Mustangs For Sale (1994-04) Jun 8, 2020
McSmash
M
Drivetrain Rear Gears For An Automatic
  • Justin87
  • Sep 20, 2017
  • Fox 5.0 Mustang Tech
Replies
5
Views
1K
Fox 5.0 Mustang Tech Sep 21, 2017
Mustang5L5
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • Classic Mustang Specific Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?