the mud moves faster than my bronco
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the mud moves faster than my bronco
hi my name is garrett and i just picked up a 79 fullsize bronco. upon getting it i went to town 3" suspension lift painted it 33x12.5" tires new big bumpers a winch some fog lites and a few other neat little doodads.
now heres the problem the guy who had it before me put in a new high power coil made a buncha of backyard mods (i.e jerry rigged wiring and some tacky gauges which ive replaced with nice ones etc). now ive also got another bronco an 84 both with the 351w sitting here i dont remeber exactly the 84's throttle body, but i know the 79 is the 351w 2brl mod setup, but heres the kicker she only hits 3500rpms with the peddle to the floor the 84 tops out at 6700rpms and the motors not being to far off from each other i think this to be a problem.
does anyone have any insight as to why my rpms are so low and or how to fix it? i was thinking it may have a rev limiter on it, but from what i understand that could be anywhere on the truck in anything almost and basically like tryin to find a needle in a haystack. someone please tell me im wrong and help me figure this out.
now heres the problem the guy who had it before me put in a new high power coil made a buncha of backyard mods (i.e jerry rigged wiring and some tacky gauges which ive replaced with nice ones etc). now ive also got another bronco an 84 both with the 351w sitting here i dont remeber exactly the 84's throttle body, but i know the 79 is the 351w 2brl mod setup, but heres the kicker she only hits 3500rpms with the peddle to the floor the 84 tops out at 6700rpms and the motors not being to far off from each other i think this to be a problem.
does anyone have any insight as to why my rpms are so low and or how to fix it? i was thinking it may have a rev limiter on it, but from what i understand that could be anywhere on the truck in anything almost and basically like tryin to find a needle in a haystack. someone please tell me im wrong and help me figure this out.
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From: just outside of Phila.
I'm not totally sure, but first of all, I think your rpm's are ok for a 2brl with 33's and no gears on it. It's probably ******* because of stock gears. It's the 6700rpm's I'd worry about...I may be wrong, but I know I'd jump out if my Bronco started hitting 6700 rpms
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From: Bend,OR
i would also double check because i dont believe that the 351w was available in the 79 bronco. I think your 79 has the 351M . these are two totally different engines. like jdmorg said gears would help, run a compression test to see where your at. also check timing and maybe needs a tune up. also the tranny might need servicing.
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From: Austin USA
yep, unless the motor was swapped it is a 351M or 400. If you have stock gears. Probably 3.55, then there is your issue. My 78 when it had a 351M, C6 and 3.55 gears if it hit a tough obstacle you could floor it and it would try and try but not get to 4K. I burned up two trannys that way. I have a manual now and 4.10s. The manaul worked well with the 3.55 gears as well. The auto trans just have to work to hard to do any thing with the old gears.
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Originally Posted by jdmorg
I'm not totally sure, but first of all, I think your rpm's are ok for a 2brl with 33's and no gears on it. It's probably ******* because of stock gears. It's the 6700rpm's I'd worry about...I may be wrong, but I know I'd jump out if my Bronco started hitting 6700 rpms
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stupid me
Originally Posted by Kemicalburns
i would also double check because i dont believe that the 351w was available in the 79 bronco. I think your 79 has the 351M . these are two totally different engines. like jdmorg said gears would help, run a compression test to see where your at. also check timing and maybe needs a tune up. also the tranny might need servicing.
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do u know?
Originally Posted by sideout2
yep, unless the motor was swapped it is a 351M or 400. If you have stock gears. Probably 3.55, then there is your issue. My 78 when it had a 351M, C6 and 3.55 gears if it hit a tough obstacle you could floor it and it would try and try but not get to 4K. I burned up two trannys that way. I have a manual now and 4.10s. The manaul worked well with the 3.55 gears as well. The auto trans just have to work to hard to do any thing with the old gears.
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park
Originally Posted by NascarNut
MBK, are you talking about revving it in neutral or park or are you actually driving your Bronco at 6700 RPM? 
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From: Austin USA
ok, that is a differant issue. You need to check the timeing, throttle cable, air cleaner. you should be able to rev it out over 6k. Not a good I dea on this motor though. It works very well at low RMPs, but stock should not be rev over 4k for to long.
as for the manaul tranny the NP435 came stock and are a dime a dozen as most people do not like the granny gear, but it sure comes in handy off road. I can live with the 1.1 4th gear.
There is not much about the 78 79 broncos I don't know about so feel free to drop me a line if you have any questions.
as for the manaul tranny the NP435 came stock and are a dime a dozen as most people do not like the granny gear, but it sure comes in handy off road. I can live with the 1.1 4th gear.
There is not much about the 78 79 broncos I don't know about so feel free to drop me a line if you have any questions.
Last edited by sideout2; Aug 19, 2004 at 03:52 PM.
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From: GRAFTON WV
i bought a 72 pickup once and it wouldnt run but about 50 mph -- checked everthing -- when i went to replace carb i found bolt missing where bracket for throttle linkage bolted to intake missing and only let me have about half pedal -- put in new bolt and no more problem -- just something you might check
