Classic Mustangs List Archive

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Mail From: Robert Carian (email redacted)

hey everyone. Well, My cowl cover came (along with a part to fix my
rear-view mirror), and I got a free Mustang Decoder book. I got some
info on my car, and found out(As I thought) it has a C-4 transmission. I
also noticed that a C-6 was an option. I would assume a C-6 has 6 speeds
(5 shifts), and was wondering what is involved in a swap? Alo, where
could I find one of these, and what do they run? If I were to do this,
it isnt anything I would do too soon, but I would like to know if I
can/should. I figure I would get better MPG and mabie better performance
at high speeds.

Another thing; how big is the gas tank on a 68 Mustang? (302) I
currently get 220 - 250 miles on a full tank of premium gas (With AC on
omst of time). I have my engine as follows; high compression pistons
(Over-bored somewhat, I dunno exactly), edelbrock 600cfm carb, Pertronix
ignition with Flame Thrower coil. I was wondering if this was
good/ok/bad milage for this setup. Also, if there are any improvements
or suggestions, let me know! I currently plan to put in a Edelbrock
intake manifold, and dual exhaust with headers...what kind of change does
anyone think this will make?

Thanks
-Rob

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Mail From: MrFomoco (email redacted)

Robert Carian wrote:
>
> hey everyone. Well, My cowl cover came (along with a part to fix my
> rear-view mirror), and I got a free Mustang Decoder book. I got some
> info on my car, and found out(As I thought) it has a C-4 transmission. I
> also noticed that a C-6 was an option.

I hope the "decoder book" was referring to optional only in the sense
that some mustang engines were paired with the C-4 and others were
paired with the C-6 or FMX units. While ordering a Mustang you might -
depending on model, year, and engine preference - be given the option of
buying one of several manual transmissions, or *an* automatic. There
were no further options within the "automatic" category.

> Another thing; how big is the gas tank on a 68 Mustang?

My records show a "refill capacity" of 16 US gallons.
--
MrF
Allen Cross
------------------------------------------------------------------------
THE online source for 1960-1973 Ford information.
voicenet.com/~fomoco
Original articles, NOS stuff, tech advice & more!

This read-only message was archived from a public mail list.
Mail From: R. Hasson (email redacted)

On Thu, 14 Aug 1997, Robert Carian wrote:

> info on my car, and found out(As I thought) it has a C-4 transmission. I
> also noticed that a C-6 was an option. I would assume a C-6 has 6 speeds
> (5 shifts), and was wondering what is involved in a swap? Alo, where
Hello,
Don't we all wish! Both the C-4 and the C-6 are three speed autos.
Later on Ford started putting overdrives in some automatics for a "fourth"
speed. The C6 is a bigger tranny used for larger HP and torque
applications. More likely to be found behind big block cars and trucks,
etc. The C-6 is also heavier and saps more power than the C-4.
If you're looking for mileage arguably a manual tranny is more
efficient, turns less power into heat, and gets better mileage. However,
it also depends a lot on driving style. Many people tend to rev manuals
quite a bit higher than an automatic usually does, so gas mileage can
plummet from this.

> Thanks > -Rob

Hope this helps!
Randy

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Mail From: Edward Chase (email redacted)

I don't think that they even make a 6 speed automatic transmission yet.
Even 6 speed manual transmissions are fairly new.

Robert, your posts to this list are full conradictions at times. A lot of
your early posts had to do with a "need for speed". Now you are looking
for good gas mileage? These 2 things don't normally go hand in hand.

Usually when you go an bore your block, up your compression, and put a nice
thirsty carb on your engine, you usually don't worry about gas mileage.

Just as a side thought, I hope you didn't stick a stock cam back in the
block after doing your other mods.

I've got a '67 coupe with a 351W bored .030 over, Edlebrock RPM carb, cam,
and intake along with Headman headers. It's a pretty peppy setup. I
haven't had it on the road yet to tell you about gas mileage. My current
project is to finish putting power disc brakes in it so it stops too. I've
also got a 9" posi rear end to put in it. (Posi burnouts are just so much
more cool!)


At 09:30 PM 8/14/97 -0300, Robert Carian wrote:
>I would assume a C-6 has 6 speeds (5 shifts), and was wondering what is
involved in a swap?>

snip

>I figure I would get better MPG and mabie better performance at high
speeds.

----------------------------------------------------------------------------
---
Edward F. Chase III | (email redacted)
Providence College | providence.edu/
Computer Services |
Providence, RI 02918 (USA) | Go Friars! (NCAA Elite Eight)

This read-only message was archived from a public mail list.
Mail From: Max Watson (email redacted)

Robert Carian wrote...
>I would assume a C-6 has 6 speeds (5 shifts)

So then a T-45 would have 45 speeds? ROTFL!!! Sorry, the C-6 is a typical
3 speed automatic, just extra beefy to handle large engines, such as a
whoop ass 390. If you really like your car, and plan on keeping it, do an
AOD conversion. The overdrive gear is a .67:1 ratio (whereis your C-4's
3rd gear is 1:1). Forget the suggested conversion to a manual tranny, your
floor console is a major obstacle.

The AOD conversion is do-able by yourself. Check the archives (as this has
come up numerous times before). You can get these trannys in unknown
condition at my local Pick'n'Pull for ~$85 out the door. Your local
wrecker will probably want $200+.

>Another thing; how big is the gas tank on a 68 Mustang? (302) I
>currently get 220 - 250 miles on a full tank of premium gas (With AC on
>omst of time).

As MrFomoco said, 16 gallons. I get similar mileage with my low
compression engine, 2 barrel Autolite carb, single point ignition, and
stock coil - all with 87 octane. I've also got single exhaust. From what
I understand, going to dual exhasut can bump gas mileage up a couple miles
per gallon. Swapping in an AOD would also help out tremendously at the
pump.

--
D. Maxwell Watson Santa Rosa, CA
<(email redacted)> TractorFactor.base.org

This read-only message was archived from a public mail list.
Mail From: Damon Koch (email redacted)

> ...If you really like your car, and plan on keeping it, do an
> AOD conversion. The overdrive gear is a .67:1 ratio (whereis your C-4's
> 3rd gear is 1:1). Forget the suggested conversion to a manual tranny, your
> floor console is a major obstacle.
>
> The AOD conversion is do-able by yourself. Check the archives (as this has
> come up numerous times before). You can get these trannys in unknown
> condition at my local Pick'n'Pull for ~$85 out the door. Your local
> wrecker will probably want $200+.
>
Can an AOD be used with a 351W? Also, how strong are they compared to the C-4?
I wasn't sure they could handle higher torque/horsepower applications like
the C-4 can.

Regards,
Damon
'65 coupe
__________________________________________________________________________
Damon Koch Sprint Paranet Currently on loan
UNIX Administrator 16475 Dallas Pkwy, suite 470 to Convex Benchmark
Phone (972) 497-4384 Dallas, Texas 75248 and Reliability Lab
(email redacted) (email redacted) Support.

This read-only message was archived from a public mail list.
Mail From: Bill Beyer (email redacted)

Max Watson wrote:
>
> Robert Carian wrote...
> >I would assume a C-6 has 6 speeds (5 shifts)
>
> So then a T-45 would have 45 speeds? ROTFL!!! Sorry, the C-6 is a typical
> 3 speed automatic, just extra beefy to handle large engines, such as a
> whoop ass 390. If you really like your car, and plan on keeping it, do an
> AOD conversion. The overdrive gear is a .67:1 ratio (whereis your C-4's
> 3rd gear is 1:1). Forget the suggested conversion to a manual tranny, your
> floor console is a major obstacle.
>
> The AOD conversion is do-able by yourself. Check the archives (as this has
> come up numerous times before). You can get these trannys in unknown
> condition at my local Pick'n'Pull for ~$85 out the door. Your local
> wrecker will probably want $200+.
>
> >Another thing; how big is the gas tank on a 68 Mustang? (302) I
> >currently get 220 - 250 miles on a full tank of premium gas (With AC on
> >omst of time).
>
> As MrFomoco said, 16 gallons. I get similar mileage with my low
> compression engine, 2 barrel Autolite carb, single point ignition, and
> stock coil - all with 87 octane. I've also got single exhaust. From what
> I understand, going to dual exhasut can bump gas mileage up a couple miles
> per gallon. Swapping in an AOD would also help out tremendously at the
> pump.
>
> --
> D. Maxwell Watson Santa Rosa, CA
> <(email redacted)> TractorFactor.base.org


Your reply leads me to ask as to the appropriate unleaded gas I should
use in my 2 C-Codes ('65 3-speed 150K miles; '66 C4 67K miles). The
fellow who sold me the '66 told me he only used premium unleaded and
then added a capful of lead additive per tankful. Is this necessary?

Thanks!

Bill Beyer

'65 C-Code Convt; '66 C-Code Coupe; '87 5.0 H.O. 5-Speed sleeper

(See them at geocities.com/MotorCity/Downs/6602/must.html)