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Boss 302S and Boss 302R FAQ

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2013 Boss 302S Transmission TR-6060

Gear Ratios: 1st: 2.66, 2nd: 1.81, 3rd: 1.30, 4th: 1.0, 5th: .76, 6th: .50

Boss 302R Transmission M-7003-BOSSR1

Gear Ratios: 1st: 2.29, 2nd: 1.61, 3rd: 1.21, 4th: 1.0, 5th: .82, 6th: .68

TAG NUMBER TUET10790

Built by George Kreppein at Rockland Standard Gear

The Boss 302R Transmission utilizes a 2003/04 Cobra Bellhousing on a T56 Magnum/TR-6060 case which causes the transmission to be "clocked" by a few degrees necessitating the use of a unique Transmission Crossmember. Note the angle of the Transmission Crossmember in page 16 of the Boss 302R Recognition Guide. This transmission also uses an Australian FG XR8 Falcon Tailshaft Housing which eliminates the TR-6060 Remote Shifter. All of this topped off with a 2007 GT500 Shifter Knob, Handle and Boot. 7R3Z-7210-AA

302R Transmission in Box.jpg
302R Trans Mount.jpg
302R Shifter.jpg
 
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Page 285 of the 2014 Ford Racing Performance Parts Catalog documents many of the parts and differences in the Boss 302R and 302S.

In my opinion there are some inaccuracies though.

A few are:

M-7003-BOSSR1 Transmission and M-4602-S One-piece Driveshaft: listed for 302R/S but they were only on the 302R.

M-17757-MB Lightweight Tubular Bumper: listed for 302R/S but it was only on the 302S.

M-3075-RA Front Lower Control Arm with Extended Ball Joint: listed for 302R/S but they were only on the 302S.

M-1104-A Front Wheel Hub with ARP Studs: listed for 302R/S but they were only on the 302S.

Etc, etc...

FRPP Boss 302R 302S Comparision.jpg
 
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cholmes1

400lb Gorilla
293
149
Denver, CO
Does anyone know the engine dyno numbers on the 302S and 302R engines (rear-wheel would work as well)? I assume the 302S with its tune and race fuel requirement, likely outputs 460+ and the RoushYates 302R engine being closer to 500.
 
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Bill Pemberton

0ld Ford Automotive Racing Terror
5,762
4,300
Exp. Type
W2W Racing
Exp. Level
20+ Years
Blair, Nebraska
I think you are quite close , as the HP was restricted by IMSA for the Boss S and my old memory is not sure but it seemed like it was pegged very close the Boss 302 output. The 444HP at the flywheel on the Boss 302 would translate back into the upper 300s for RWHP and for some reason I remember low 400 RWHP race requirement for the Boss S. I am sure BS 1 or someone else will pop in with the correct numbers , but surprisingly it was not a big jump.
 
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Does anyone know the engine dyno numbers on the 302S and 302R engines (rear-wheel would work as well)? I assume the 302S with its tune and race fuel requirement, likely outputs 460+ and the RoushYates 302R engine being closer to 500.

RYR 302R spec in 2014 in IMSA w/OEM airbox and OEM exhaust manifolds, wet sump and our exhaust made about a max of 430 hp w/o restrictor to the tire. Never knew what they made on the engine dyno.
 

cholmes1

400lb Gorilla
293
149
Denver, CO
Not certain if this was known, but Ford has placed all of the 302S PDFs on the website. Should help with some troubleshooting. It does not really help that much with part numbers or locations, but always nice to have a resource.


I also combined CobraR77's information into a PDF
 

Attachments

  • IMSA Grand-AM Boss 302R Recognition and Requirements.pdf
    4.1 MB · Views: 172
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