Personal Experience with Gear Upgrades? - Page 3 - Forums at Modded Mustangs
 7Likes
Reply
 
LinkBack Thread Tools
post #41 of 44 Old April 26th, 2017, 01:46 AM
US Air Force (retired)
 
Eagle2000GT's Avatar
 
Join Date: Aug 2007
Location: Indiana
Posts: 13,367
                     
Garage
iTrader: 1 reviews
Quote:
Originally Posted by gogone3 View Post
I wont have a blower for at least 5 years haha so my n/a setup, dont even have cams yet (prolly engine work in 3 years)
I like the 4.10 with the bullitt intake. Imo.
They probably fit well into your driving style and horsepower range. Outside of that others might not feel that way.

ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370.
USAF 1969-1973,1980-1996: Vietnam veteran. Aircraft maintenance. R & D, ICBM Operations.
Also own: 1997 Harley FXDWG, 1998 F-150, and 2002 Corvette LS1
Eagle2000GT is offline  
Sponsored Links
Advertisement
 
post #42 of 44 Old April 28th, 2017, 03:28 PM
Rent Asunder!
 
RDY4WAR's Avatar
 
Join Date: Feb 2010
Location: Augusta, Ga
Posts: 11,805
                     
iTrader: 0 reviews
I decided to run my math again with my own 66 Mustang and its 289. I've been debating back and forth about whether or not to keep the C4 and stock 2.80 gear it has now or swap in an AOD with a 4.11 gear. It kinda shocked me how little the difference is between them.

From a dead stop, 4k stall converter in both.


Big advantage to the 60ft of .23 seconds for the AOD, but then look at the 1/8 and 1/4. That advantage doesn't carry out. The 1/8 advantage is .33 seconds and 1/4 is the same .33 seconds. The C4 with the 2.80 gear stays in 2nd gear the entire way from about the 330ft onward.

From a 40-85 roll.


A difference of just .035 seconds. Not even half of 1 tenth of a second difference in a roll race.

Both of these cars would cruise right at 2600rpm @ 70mph. Well... the AOD would in lockout. The C4 with a 10" 4k stall would have about 10% converter slip cruising down the highway so it would be more like 2860rpm.

A 4k stall converter from Hughes or TCI for the C4 is about $550-580. No 4k stall lockup converter is readily available on the shelf for the AOD which means a custom converter in the neighborhood of $800+. I could buy a 3000-3400 stall converter off the shelf with lockup for about $500 but then I'd most likely lose all of the 60ft advantage of the AOD to begin with.

On top of that, I already have the C4 and in stock form, can more than handle the power of this engine. An upgraded valve body ($300) to firm up the shifts, stronger input shaft ($150), 4k stall converter ($550), and deep pan + fluid cooler ($200) to keep heat down with the high stall on the highway would be less than $1,200. With the AOD, I'd be looking at $500-600 for a used AOD, plus another $500-600 for all the swap parts such as a TV cable, crossmember, trans mount, linkage, etc... another $150-200 for a shortened driveshaft, $150 for a stronger input shaft, $400 for a valve body to eliminate the dreaded 3rd gear partial lockup, and then still need to cover the cost of the converter, cooler, and 4.11 gear. Due to the extra width of the AOD, the vast majority of the headers and mid-pipes on the market won't fit around it so you either have to go with a full setup of JBA headers and mid-pipe ($800+) or have something custom made.

I think I'll stick with the C4 and 2.80 gear.

1993 Camaro bracket car
2002 Tahoe family/tow rig
2006 Altima daily
RDY4WAR is offline  
post #43 of 44 Old April 28th, 2017, 06:50 PM
Dat guy
 
Join Date: Jul 2012
Location: abilene
Posts: 483
 
iTrader: 1 reviews
Quote:
Originally Posted by RDY4WAR View Post
I decided to run my math again with my own 66 Mustang and its 289. I've been debating back and forth about whether or not to keep the C4 and stock 2.80 gear it has now or swap in an AOD with a 4.11 gear. It kinda shocked me how little the difference is between them.

From a dead stop, 4k stall converter in both.


Big advantage to the 60ft of .23 seconds for the AOD, but then look at the 1/8 and 1/4. That advantage doesn't carry out. The 1/8 advantage is .33 seconds and 1/4 is the same .33 seconds. The C4 with the 2.80 gear stays in 2nd gear the entire way from about the 330ft onward.

From a 40-85 roll.


A difference of just .035 seconds. Not even half of 1 tenth of a second difference in a roll race.

Both of these cars would cruise right at 2600rpm @ 70mph. Well... the AOD would in lockout. The C4 with a 10" 4k stall would have about 10% converter slip cruising down the highway so it would be more like 2860rpm.

A 4k stall converter from Hughes or TCI for the C4 is about $550-580. No 4k stall lockup converter is readily available on the shelf for the AOD which means a custom converter in the neighborhood of $800+. I could buy a 3000-3400 stall converter off the shelf with lockup for about $500 but then I'd most likely lose all of the 60ft advantage of the AOD to begin with.

On top of that, I already have the C4 and in stock form, can more than handle the power of this engine. An upgraded valve body ($300) to firm up the shifts, stronger input shaft ($150), 4k stall converter ($550), and deep pan + fluid cooler ($200) to keep heat down with the high stall on the highway would be less than $1,200. With the AOD, I'd be looking at $500-600 for a used AOD, plus another $500-600 for all the swap parts such as a TV cable, crossmember, trans mount, linkage, etc... another $150-200 for a shortened driveshaft, $150 for a stronger input shaft, $400 for a valve body to eliminate the dreaded 3rd gear partial lockup, and then still need to cover the cost of the converter, cooler, and 4.11 gear. Due to the extra width of the AOD, the vast majority of the headers and mid-pipes on the market won't fit around it so you either have to go with a full setup of JBA headers and mid-pipe ($800+) or have something custom made.

I think I'll stick with the C4 and 2.80 gear.
3 tenths seems like a pretty good difference to me in the 1/4. But if the cost is huge maybe not.
gogone3 is offline  
Sponsored Links
Advertisement
 
post #44 of 44 Old April 28th, 2017, 09:39 PM
Rent Asunder!
 
RDY4WAR's Avatar
 
Join Date: Feb 2010
Location: Augusta, Ga
Posts: 11,805
                     
iTrader: 0 reviews
Quote:
Originally Posted by gogone3 View Post
3 tenths seems like a pretty good difference to me in the 1/4. But if the cost is huge maybe not.
For the extra $1k, I could upgrade the doors, hood, and trunk lid to all fiberglass. (gotta replace them anyway) Or I could put that $1k into a FiTech EFI system. Just better uses for the money than gaining 3 tenths in the 1/4 when the car will be 90% street driven.

1993 Camaro bracket car
2002 Tahoe family/tow rig
2006 Altima daily
RDY4WAR is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Forums at Modded Mustangs forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome