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post #1 of (permalink) Old 03-12-2006, 07:45 PM Thread Starter
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Mileage help please- 87 Chevy 350TBI

Hey guys,
As my tow rig, I've purchased a 87 Chevy 3/4 ton 4x4. It has the original 350TBI with a TH400 and 4.10 gearing.
Since I plan on basically driving this on weekends,I would appreciate any mileage tips that you can give me. Some of the following items I plan on doing are as follows-
1. K&N style air cleaner?
2. Upgrade from the 31-10.50 MTR's to a 33-12.50?
3. Underdrive pulleys?
4. Switch to a 700R4? Is this a big deal?
Any suggestions, or should I leave everything alone and make sure both tanks are full?
Thanks
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post #2 of (permalink) Old 03-12-2006, 08:30 PM
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Re: Mileage help please- 87 Chevy 350TBI

the over drive swap is your best bet. tires might help a little, but you loose more with the extra spinning mass.
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post #3 of (permalink) Old 03-12-2006, 09:29 PM
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Re: Mileage help please- 87 Chevy 350TBI

1. K&N is fine, but if it were mine I'd find out if I could get the taller filter element and lid to fit on there. Increasing the surface area of the media.

2. Heck no on the 33-12.50. Wider tire = bad economy. Has it got 15" or 16" wheels? A 33" height wouldn't be bad for you, you've got the 4.10s.

3. Figure on an electric fan conversion helping more than those will.

4. Overdrive = bueno. 700R4 decently built, or a 4L80-E with stand-alone computer are both viable options.

You'll never end up leaving everything alone. There's too many of these trucks out there with neat stuff on them that will give you ideas.
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post #4 of (permalink) Old 03-13-2006, 05:40 AM Thread Starter
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Re: Mileage help please- 87 Chevy 350TBI

[ QUOTE ]
1. K&N is fine, but if it were mine I'd find out if I could get the taller filter element and lid to fit on there. Increasing the surface area of the media.

2. Heck no on the 33-12.50. Wider tire = bad economy. Has it got 15" or 16" wheels? A 33" height wouldn't be bad for you, you've got the 4.10s.

3. Figure on an electric fan conversion helping more than those will.

4. Overdrive = bueno. 700R4 decently built, or a 4L80-E with stand-alone computer are both viable options.

You'll never end up leaving everything alone. There's too many of these trucks out there with neat stuff on them that will give you ideas.

[/ QUOTE ]

1. Is there a factory set-up that you recommend? I doubt that it's as simple as getting a taller air cleaner and flipping the lid upside down.

2. 16" wheels.

3. Tranny swap. Something to look into...

Thanks.
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post #5 of (permalink) Old 03-13-2006, 08:35 AM
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Re: Mileage help please- 87 Chevy 350TBI

What I meant was there might be a taller lid out there somewhere (junkyard?) for the TBI trucks. I know the carb'd ones have taller lids for the 5"-6" high filters. If they're the same diameter perhaps one would work for you. Then I'd find an amsoil, K&N, aFe, or somebody's washable air filter element for it.

Hmmmm, tires for 16" wheels. Are they stock steel, or are they aftermarket? I've got 235/85s on my '83 K2500 w/4.10s. Next go round I'd like to test fit some 255/85 tires and check clearance. You mentioned this is a weekend driver, will it be going up in the mountains or doing any off roading?
post #6 of (permalink) Old 03-14-2006, 05:44 AM Thread Starter
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Re: Mileage help please- 87 Chevy 350TBI

Right now, I have factory steel wheels on it. Everything has been redone, sheetmetal replaced and truck painted.
Basically, the truck will be used to tow my CJ-7. I have another daily driver I can drive everyday.
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post #7 of (permalink) Old 03-14-2006, 07:53 PM
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Re: Mileage help please- 87 Chevy 350TBI

i personally like the high flow air filters you can throw away. i have K&N's for most things i have that also have mowers. but, cleaning them is such a pain. i took out the K&N's and just use a high end paper filter. i can't tell the difference in how the motor runs.
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