What gear ratio for a 4spd Toploader ?

Stangninjak

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Apr 16, 2004

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Oct 24, 2006

#1

• Oct 24, 2006

• #1

I am going to do my rear end with a new 3rd member. Going with a true trac posi, and I was wondering what gear size/ratio would work with a Toploader 4spd ?

Street car/cruise, that see the track as well sometimes.

As always thanx in advance !

 

LMan

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Aug 10, 2002

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Mom's basement

Oct 24, 2006

#2

• Oct 24, 2006

• #2

3.50

 

ga289stocker

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May 23, 2006

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Sugar Hill, Ga

Oct 24, 2006

#3

• Oct 24, 2006

• #3

Stangninjak said:

I am going to do my rear end with a new 3rd member. Going with a true trac posi, and I was wondering what gear size/ratio would work with a Toploader 4spd ?

Street car/cruise, that see the track as well sometimes.

As always thanx in advance !

Click to expand...

Well I can tell from expericene as I have a toploader in my 65 and have used both a 3.55 open and at 3.80 trak loc now. I use the car to cruise and trips to the local track about 40 miles away. I love the 3.80 gear and only picked up about 200 rpm at 60 mph. Around town it's great, ***however*** if you plan on doing much freeway driving go w/ a 3.55 or lower #. The worst part of my trip to track is the 20 miles or so on the interstate. I'm doing
60mph at 3050 rpm 25" tires and about getting blown off the road by everyone...Car did pick up over 2/10's and 1 mph thus far w/ 3.80 gears vs. my old 3.55 open unit. I will say that I have a t-5 to go in car once i get all the parts together and can not wait to do that swap for driveablity at speeds over 60 or so...fyi this is w/ 8" rear

 

fasttback

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Apr 16, 2005

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Northern CA

Oct 24, 2006

#4

• Oct 24, 2006

• #4

3.25 - 3.89 depending on tire size and tolerable rpms on the freeway. Try a search, there is a lot of posts on this subject.

 

Stangninjak

Member

Apr 16, 2004

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Oct 24, 2006

#5

• Oct 24, 2006

• #5

fasttback said:

3.25 - 3.89 depending on tire size and tolerable rpms on the freeway. Try a search, there is a lot of posts on this subject.

Click to expand...

Heh thanx Fastback. I found a ton of info when I did a search. Heh I did not realize there was that much stuff on this topic ! have my answer, thanx again.

 

D

D.Hearne

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Sep 29, 2000

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south louisiana

Oct 24, 2006

#6

• Oct 24, 2006

• #6

One more variable you need to consider-- what Toploader? Wide or Close ratio? With a wide ratio, 3.50's are perfect for street and freeway. With a close ratio and a less than torquey motor, you'll need to step up to 3.70-3.90's, to compensate for the close ratio's taller 1st gear.

 

Stangninjak

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Apr 16, 2004

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Oct 24, 2006

#7

• Oct 24, 2006

• #7

D.Hearne said:

One more variable you need to consider-- what Toploader? Wide or Close ratio? With a wide ratio, 3.50's are perfect for street and freeway. With a close ratio and a less than torquey motor, you'll need to step up to 3.70-3.90's, to compensate for the close ratio's taller 1st gear.

Click to expand...

hey D.Hearne. I think its a wide ratio..if so the I will be happy with 3.50's where on the case do i look ? I going to do the refresh kit in it as well.

 

D

D.Hearne

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south louisiana

Oct 25, 2006

#8

• Oct 25, 2006

• #8

There should be a tag on the passenger side of your Toploader that's got the Id code. Get the code then go over to David Kee's website and he's got a chart there that'll tell you which Toploader you have. www.4speedtoploaders.com The wide has a 2.78 1st gear, the close is a 2.32 1st.

 

A

amorrow

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Jul 15, 2005

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St. Charles, IL

Oct 25, 2006

#9

• Oct 25, 2006

• #9

I'm just getting ready to order my wide-ratio Toploader to go along with my 9" with a 3.50 gear and TrueTrac differential. The wide-ratio/3.50 combo is exactly what David Kee (quite the expert from that I hear) recommended for my performance-oriented, street-driven project.

 

1320stang

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Nov 13, 1998

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Edmond, Oklahoma

Oct 25, 2006

#10

• Oct 25, 2006

• #10

I was going to say 3.50 as well.

 

K

Kman

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Connecticut

Oct 25, 2006

#11

• Oct 25, 2006

• #11

Have the 3.50 and wide ratio combo in my 65 K code and I love it.

 

Stangninjak

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Apr 16, 2004

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Oct 25, 2006

#12

• Oct 25, 2006

• #12

Hey thanx all for the reply's. 3.50 it is then ! I am pretty sure it's a wide ratio..

Thanx D.Hearne for the location info. I will ramp it up tonigt and take a look to make sure. With the 3.50's and some posi action, my 1 wheel peels will be a thing of the past !

As always this forum supplies great info :SNSign: