Re: 460 into a 91 Bronco Possible? -- Big Bronco Board

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Date Posted: 12:33:41 02/20/02 Wed
Author: Tom DeGideo II
Subject: Re: 460 into a 91 Bronco Possible?
In reply to: Passing along 's message, "Re: 460 into a 91 Bronco Possible?" on 16:18:04 07/06/01 Fri

>Got a mechanic guru beside me right now (I'm looking
>into buying a 88 Bronco myself so I'm running through
>the message boards getting information).
>
>Anyhow, the answer is 'yes'. You need to replace the
>motor and transmition and you can get that out of an
>earlier 73' or 74' full size Bronco (snag it from the
>junk yard).
>
>Hope that helps.
Your '91 has EFI,so I'm assuming you want to swap in a EFI460,and not a 460 4-V.You'll need 460 motor mounts from a F-250/F-350,or E-350.The transmission your Windsor V-8 has behind it won't bolt-up behind a 385-series big-block 460....the bellhousing bolt patterns are different.You can use either a C-6 auto,or a E40D auto,but it must be from a 460-powered donor truck,or van.You'll also have to go with an aftermarket,remote oil filter.The stock postition of it on a 460 will have clearance problems.You could use O.E.M. EFI460 truck exhaust manifolds,but aftermarket headers are offered for 460 swaps into late-model Broncos by a few different companies.They might be "pricey",but they'll add more torque,and some decent horsepower gains.You'll also have to have the truck re-wired,which is time consuming,but not impossible.My guess is if you let someone do the job,it will be expensive.I would buy both a 1991 Ford Bronco/truck EVTSM manual& wiring diagrams which you can buy through a Ford dealership parts dept.,or directly from Helm,Inc.As far as your Bronco's cooling system is concerned,it should do fine to keep the 460 running cool,but you might add an external engine oil cooler,mounted on the radiator,or use aftermarket fans.A stock C-6,or E4OD trans will handle a stock,or mild EFI460's power well enough.If you build the 460 to over 300 hp,and 450+ lb./ft. of torque,I would have the transmission behind it beefed-up,and add a cooler to keep it's fluid temperature down.Your BW1356 T-case,and the factory Dana 44 front axle&Ford 8.8"rear axle should hold up well with a 460 on board,if they are all in good condition.I assume your axle ratio(s) are 3.55:1.With a big-block's torque,and stock size tires,you won't need a lot of gear.For tires larger than stock you might swap in some 4.10s,or 4.56s(unless your Bronco came with 4.10s via the factory...axle code H5 on door tag).Don't expect good fuel milage with either of the steeper ratios.A 460 coupled with 3.55s in a Bronco should get about 11-12mpg.Lastly,just remember that a 460 will add about an extra 250lbs. over the front wheels,so your Bronco's handling will be different,and brakes will wear out faster.....especially up front! Well,good luck with your 460 swap.I'm planning one for my '90 Bronco.Take care.

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