Proper gears etc for blown hemi

[Blown polara]

I have drag raced for years but in the 12 sec region. Now i have a 12pt caged, severely lightened 64 polara chassis that was 2850lb with iron head 440. It has ladder bars and old 13.5x31.5 slicks that will be replaced but max out the wheel tubs. I am Working with Ray Barton to build a 477 inch ( 4.5x3.75) 7.1 rod aluminum hemi with 10-71 teflon stripped blower shop blower bug catcher efi, davis traction control,snow water meth injection. will be dynoed and tuned by barton. Has his cnc ported stage v heads and rockers. Crower custom Street series Mech roller cam. A&A trans with everything he can throw at it. Moser dana 60. Street driven. Barton says 1k hp no prob. But probably not with 12% underdrive not wanting max et but probably run the 1/8th to keep trap speeds down what gears do you guys recommend? Do i have enough tire? Thanks!

 

[33 IMP]

Considering it's a Dana 60, there isn't a whole lot of choice available. Personally, considering street driven, I would put in 3.54. Surely not more than 4.10. The 3.54s should make it easier to hook up that much power.
What gear is in it now?

 

[yella71]

Have a chat with hemi-itis....

 

[Fran Blacker]

Tire diameter needs to determined them gears. MO. If run tall tire with 3.54's the ratio will (higher) less than a 26" tire. 4.10's with a 26" tire on the interstate 60mph will drive you nuts.

 

[PRHeads]

I’m sure Ray can tell you what gears to run in the car.

 

[Cojohnso1]

Considering it's a Dana 60, there isn't a whole lot of choice available. Personally, considering street driven, I would put in 3.54. Surely not more than 4.10. The 3.54s should make it easier to hook up that much power.
What gear is in it now?

Gear selection and availability is one of the Dana's drawbacks. I have ProStreet project with about 1200 HP on a big mountain motor. The tires in pic are 32x15" which are about 1.5" too wide. Thus very similar to your situation. For me? Because the engine is lower RPM due to cubic inch size. (904 ci DOHC Marine Schubeck.) 3.54:1 is a no brainer. It's the "Street" part of build that made my decision easy. My problem is transmission selection. Which of course is a whole different subject matter.

 

[Blown polara]

Gear selection and availability is one of the Dana's drawbacks. I have ProStreet project with about 1200 HP on a big mountain motor. The tires in pic are 32x15" which are about 1.5" too wide. Thus very similar to your situation. For me? Because the engine is lower RPM due to cubic inch size. (904 ci DOHC Marine Schubeck.) 3.54:1 is a no brainer. It's the "Street" part of build that made my decision easy. My problem is transmission selection. Which of course is a whole different subject matter.

View attachment 1159580

 

[Blown polara]

Ms

Gear selection and availability is one of the Dana's drawbacks. I have ProStreet project with about 1200 HP on a big mountain motor. The tires in pic are 32x15" which are about 1.5" too wide. Thus very similar to your situation. For me? Because the engine is lower RPM due to cubic inch size. (904 ci DOHC Marine Schubeck.) 3.54:1 is a no brainer. It's the "Street" part of build that made my decision easy. My problem is transmission selection. Which of course is a whole different subject matter.

View attachment 1159580

Man thats really cool! I have a great deal of respect for anyone trying that! I have much interest in anything with pistons! I have 2 gmc 702 v12s, P&W R2800 radial piston and con rod hanging on the wall and a 9ft long 2000lb rod out of a nordberg diesel. Whats some specs on it? Thinking now about a non phord, phord 9in fabbed unit, i dtove my newport to work and everywhere else with 4.56's,on 60 series 14's dad drove 5.20s to school 40mi, my military vehicles were around 5.70 but im liking the way you think! Should i leave in 2nd With 727

 

[Cojohnso1]

Ms

Man thats really cool! I have a great deal of respect for anyone trying that! I have much interest in anything with pistons! I have 2 gmc 702 v12s, P&W R2800 radial piston and con rod hanging on the wall and a 9ft long 2000lb rod out of a nordberg diesel. Whats some specs on it? Thinking now about a non phord, phord 9in fabbed unit, i dtove my newport to work and everywhere else with 4.56's,on 60 series 14's dad drove 5.20s to school 40mi, my military vehicles were around 5.70 but im liking the way you think! Should i leave in 2nd With 727

Engine specs. 904 ci DOHC cam custom poured aluminum block and heads. 4.9" bore with custom 6" Crowler crank. 10.1:1 compression built for pump 91 gas. Heads are 2x 1.9" Intake valves. 2x 1.5" exhaust. Putting out 1200 HP at 5200 RPM. 1150 Lbs torque at 3000. Redline 6500.

Because of lower RPM higher gear set will be needed. This should also bleed some of the low-end torque. But still far more than tires could hold. So launch RPM should be around 2k.

The engine is 5" wider than race 426 hemi. After some measurements and comparisons to A-body? We found E-body is 5" wider than A-body. So the same issues those who put a 426 hemi in an A-body I have with this and an E-body. Starting with shock towers. But the advantage today? A lot more chassis and suspension options than late 60s early 70s.

As I mentioned. My real concern is transmission. The 904 block is big enough to have both Chevy and Chrysler BB bellhousing bolt patterns. The crank is drilled 8 hole for a hemi flywheel. So there is manufacturer options. I currently have a JW Ultrabell Power Glide that can easily handle the power. But those transmissions heat up. Thus not ideal for any street life. I have been in contact with Passon, G-Force, Liberty and Tremec. All agree there is a performance gap for manual transmissions and today's power options. Tremec has the best chance. They have at least discussed build options. Lenco is an obvious option. Just didn't like all them levers and it's semi automatic design is also not the most street funtional.

So still searching for the transmission that can let me have my cake and eat it too?

 

[yella71]

You need an 8 spd trans out of a newer diesel pick up like a 5500 ram or dare i say 550 ford or an Alison for a gm

 

[Cojohnso1]

You need an 8 spd trans out of a newer diesel pick up like a 5500 ram or dare i say 550 ford or an Alison for a gm

I considered. But they too are rated lower than what would be asked. I even considered 6 speed manual NV5600 that is currently in my 2007 Cummins Ram 3500. But it too is only rated to about half what is needed. The Alison would require some bellhousing re-design.

 

[33 IMP]

With that engine I would probably go with the very best turbo 400 I could find. I would want transbrake ability in first and second, and It would have to be durable with a second gear leave.
Maybe they could build the same strength in a 4L80.

 

[Cojohnso1]

With that engine I would probably go with the very best turbo 400 I could find. I would want transbrake ability in first and second, and It would have to be durable with a second gear leave.
Maybe they could build the same strength in a 4L80.

That's really the same problem as the Power Glide. Thoughs high end race transmissions are not designed for street use. The Gear Vendor OD unit does help distribute heat thus may be able to trans cooler it out. The Cuda once had a crashboxed A833 trans with a race hemi. (The car was originally V-code 440-6. But that engine and trans long gone.) Car was so heavily modified for drag racing. That build to a more original build was not in my skillset. (Yet the crazy hike in value of E-bodies is making me question my decision to build Pro Street.)

 

[Blown polara]

Posted some pics but apparently didn't show up here. I went with a 260/270 at .050 on a 110 ctr mechanical roller just to bleed off torque. Got a trans brake but only for my disabled right leg to launch with. Font need or want to rev it much above idle at launch. Davis traction control. Barton is going to set up efi bug catcher on dyno. I can always pulley it down

 

[Blown polara]

We will try pic again

 

[Cojohnso1]

Like I mentioned. Tremec believes they may be able to build a 6 speed with billet polished gears from their new Magnum F platform that can handle. Especially if matched with a multi disc clutch application. (I'm betting that will cost a pretty penny?)

 

[Blown polara]

So, after listening to your input, and thanks for not being abusive mopar purists! I am not inclined to spend 10k on a 727 with a useless 1st gear that wont launch in 2nd then have TC selection issues. I hate to say it but looks like a $3k power glide will do better here, and fabbed 9in over D60 is the way to go. Mopar oem WAS better than either but at these power levels aftermarket support and ease of maintenance make a huge difference!

 

[Blown polara]

Why do PG trannies heat up street driving? Is there something im missing? Especially in a high torque low rpm situation where low stall speeds are concerned? In 3000lb car? My engine should idle below 1k, torque will be 750 to 900 by 3500, 2800lb car. We daily drove 3200 stall in 4800lb Newport pulling 20k lb of grain to evevator with a 440 6bbl that lifted the front wheels. Full manual 4.10 gears took off in 2nd all the time empty. Never over 200deg trans temp.

 

[dvw]

That thing needs a Lenco and a GOOD Converter drive
Doug