gt40 heads

Jaber10 · 04-22-2006, 01:57 PM

Prolly a dumb question but what is the big difference between 4.10's and 3.73's. Like if i get 4.10's what will my car do differently than a stock application. Also i think i am going to go w/ the gears first before the heads. Id rather get the smaller things done and then hit the engine all at once (new intake, heads, rockers, etc)..

rwhite65 · 04-22-2006, 05:08 PM

The 4.10's are gonna give the car better acceleration, due to a better gearing ratio. The down side is they will top out at a lower top end speed. This use to be a major trade off in the day of 4 speeds, but with a 5 speed having that tall 5th gear, you loose very little top end.

Ryan

Jaber10 · 04-23-2006, 08:58 PM

Awesome....the 4.10's seem like the way to go. And I believe I am going to do that first and tackle the engine all at once. Thanks for the help guys.

Also, how long does it take to install the 4.10's? Is it real complicated once you get into that differential? What other parts do I need to purchase besides the gears for this swap (gaskets, etc...)?

thanks

rwhite65 · 04-24-2006, 12:08 AM

I personally wouldn’t tackle the gear change alone without some help. They are not supposed to be overly hard, but if you don’t get things shimmed right, they can end up failing.

There will be guys that speak up here, who know more on this then me.
Ryan

redsn95vert · 04-24-2006, 05:23 PM

do yourself a favor and take it to a tranny shop and have a pro do the gear swap. The way it was explained to me a few years ago is that the older the diff. is the harder it is to swap in new gears and get them shimmed right. I do everything myself, but I wuldn't touch the gears. As for the heads, those GT40p heads are off the 5.0 exploders, and need special headders. Thoses hookers you have will mate up with just about most of the after market heads out there.

Jaber10 · 04-24-2006, 08:01 PM

Yah...it seems taking it to the shop would be the best idea for the years. This is the first car that I have tried to work and therefore im learning the mechanical side as I go. Im sure i would mess something up real bad.

04-22-2006, 01:57 PM	#1
Jaber10 Registered Member Join Date: May 2005 Posts: 33	Re: gt40 heads Prolly a dumb question but what is the big difference between 4.10's and 3.73's. Like if i get 4.10's what will my car do differently than a stock application. Also i think i am going to go w/ the gears first before the heads. Id rather get the smaller things done and then hit the engine all at once (new intake, heads, rockers, etc)..

04-22-2006, 05:08 PM	#2
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: gt40 heads The 4.10's are gonna give the car better acceleration, due to a better gearing ratio. The down side is they will top out at a lower top end speed. This use to be a major trade off in the day of 4 speeds, but with a 5 speed having that tall 5th gear, you loose very little top end. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

04-23-2006, 08:58 PM	#3
Jaber10 Registered Member Join Date: May 2005 Posts: 33	Re: gt40 heads Awesome....the 4.10's seem like the way to go. And I believe I am going to do that first and tackle the engine all at once. Thanks for the help guys. Also, how long does it take to install the 4.10's? Is it real complicated once you get into that differential? What other parts do I need to purchase besides the gears for this swap (gaskets, etc...)? thanks

04-24-2006, 12:08 AM	#4
rwhite65 Ride Hard Join Date: Oct 2000 Location: Wyoming IL Posts: 1,094	Re: gt40 heads I personally wouldn’t tackle the gear change alone without some help. They are not supposed to be overly hard, but if you don’t get things shimmed right, they can end up failing. There will be guys that speak up here, who know more on this then me. Ryan __________________ 65 Fastback 91 roller 306, H/C/I AOD-Bauman, PI Stallion, 4.10's and traction loc 04 Grand Cherokee Freedom Edition 79 Ford F-250 4x4 - Restored

04-24-2006, 05:23 PM	#5
redsn95vert Registered Member Join Date: Jul 2000 Location: Rochester Posts: 323	Re: gt40 heads do yourself a favor and take it to a tranny shop and have a pro do the gear swap. The way it was explained to me a few years ago is that the older the diff. is the harder it is to swap in new gears and get them shimmed right. I do everything myself, but I wuldn't touch the gears. As for the heads, those GT40p heads are off the 5.0 exploders, and need special headders. Thoses hookers you have will mate up with just about most of the after market heads out there. __________________ 95 GT convertable, ported+polished GT40 heads, port matched upper and lower Cobra intake manifold, Flowthech headers, Catco hi-flow h-pipe with 2 hi-flow cats, Mac true fit catback exhaust, 3.73 gears, underdrive pullies, Edelbrock 70mm throttle body, Mac cold air intake, FMS 24lb injectors, Granatelli 75mm mass air

04-24-2006, 08:01 PM	#6
Jaber10 Registered Member Join Date: May 2005 Posts: 33	Re: gt40 heads Yah...it seems taking it to the shop would be the best idea for the years. This is the first car that I have tried to work and therefore im learning the mechanical side as I go. Im sure i would mess something up real bad.

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