Bronco Performance Eng Recomendations

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Saltydog

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O.K. Guy's Here Goes,

Just registered with your site and am looking for advise on replacement short or long block motors. I just had to part ways with my '05 Dodge Ram 3500 4x4 with a bullydog equiped cummins, ( Truely Sad Day). I have purchased my First Ford Bronco ( 1980 4x4 w/ 6" lift ). I found this truck to be lacking alot of the " Get up and Go" that I loved with my Dodge. I am an experienced Mech, but have very limited experience with Ford Bronco small blocks in trucks this size. I was amazed that this truck has a 351W with only a 2-BBL Carb. Front and rear mains are leaking, Carb is leaking, but Bronco still runs, just seems to lack alot of the power I'm used to. As I was not involved in building this motor, I cant be sure wheather this motor is performing to spec's. I will be rebuilding the Carb this weekend, but am seriously considering building another motor for this truck within the next month, that will be equiped with a 4-BBL. Any suggestions????? Not looking to make this into a tire shreadding rocketship, but want to be able to have the power required to get it up and going when I put the pedal down. I'm sure some of your members have repowered with motors that have incresed H.P. Also note that she is riding on 35's, and a 9" rearend. The ring and pinion will also need to be replaced due to excessive play, but I'm assuming the it still has original gearing. Any Motor / Gear Ratios combos would be a GREAT help in allowing me to appreciate this truck as much as the one I lost.

Thank You again for any help,

'DOG

 

Seabronc

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If it has 35s and the original gearing it will definitely be a dog, (pardon the expression :D ), off the line. That is way bigger than the original tires which are about 28s. They didn't offer the 4BBL until 84 or 85. I'm not a fan of rebuild kits since they don't address wear problems especially ones that cause vacuum leaks.

If the differential still has a tag on it, it probably is the original gearing but you can do a rough check by putting the rear on jack stands and turning a wheel while counting the number of turns of the drive shaft. The original rear gear code should be on the Safety Compliance sticker, (not sure on the 80, but on mine it is located on the driver B post). It will have a code under AXLE at the bottom of the sticker. 18 = 3.08, 19 = 3.55, H8 = limited slip 3.08 and H9 = limited slip 3.55

Attached is a gear selection chart from our sponsor The Bronco Graveyard http://www.broncograveyard.com . It is calibrated for a 555 MPH cruise. You can use the formula above to determine the proper rear gearing at your normal cruising speed.

Good luck,

:)>-

Gear selection.jpg

 

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