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Old 01-16-2007, 11:04 PM   #1
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1988 34.5' Airstream 345
CUMMING , GA
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345 engines

I am missing my chevy manual so I have no idea what exact engine and trannie my "new" 345 has. Anybody have an idea?
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Old 01-16-2007, 11:05 PM   #2
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uh duh, my "new" 1988 345.
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Old 01-16-2007, 11:39 PM   #3
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1989 34.5' Airstream 345
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Chevy/GM 454 c.i. big block.
400 Turbohydramatic 3 speed, non-overdrive.

Most common.

Freds Airstream Archive can supply much info.
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Old 01-16-2007, 11:40 PM   #4
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1985 34.5' Airstream 345
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Quote:
Originally Posted by wpapke
I am missing my chevy manual so I have no idea what exact engine and trannie my "new" 345 has. Anybody have an idea?
I assume that you have the same "big block" chevy that I have, which is the 454. Mine is an '85 345. Sorry I don't know which tranny it is. TH 350 or 400 I think. I'm sure one of the sharp guys will chime in soon. How about some pictures of your new toy? Ron
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Old 01-17-2007, 06:39 AM   #5
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Welcome Ron, hope we'll get a chance to see your "new" 345 at Hiawassee in April....
How many miles? Project or ready to camp? Photos??? Detail!! We love the details.
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Old 01-17-2007, 08:05 AM   #6
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I agree with all...but I think the 345s had a TH475 (version of the TH400) tranny.

Welcome to the club!
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Old 01-17-2007, 09:54 AM   #7
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345 engine

Never heard of that engine But I do Know in most applications they havent used the TH350 or Th 400 in years. I think in 80 they switched to metric trannys then upgraded themm to the 200 R4 And 700 R4 made adjustments to them. Then changed the design to the E460LE and E480 Le.
also the allison tranny Most differences can be determined by the Pan. That would be the best way to tell or Have the dealer parts dept pull what is known as a aquarious.... Like the star sign on the vehicle and they can give you the chassis Build sheet for that Unit
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Old 01-17-2007, 10:00 AM   #8
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Steven is correct---The transmission is a TH475, which is the heavy duty version on the Th400. It has straight cut gears in first and second---suposed to be stronger. They are pretty tough transmissions.

The engine is the Chevy 454 and is rated at about 230 hp and about 340 ft. lb. of torque at about 3200 rpm if I remember correctly. Some of the 1988 motorhomes had a carburater (as mine does) and some may be fuel injected, depending on the manufacture date of the chassis. If injected, it might have slightly more power and torque that the carburated version (not sure).

The rear end should be the Dana 70HD with disk brakes and a final ratio of 4.56 to one. At least that is what is under mine.

Hope this helps-------Bob
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Old 01-19-2007, 07:25 PM   #9
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1987 34.5' Airstream 345
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from 1993 Chevrolet Motor Home Chassis Service Guide...
(you need the chassis VIN for this, not the AS VIN)
example from our 1987 345 (with 1986 P30 chassis):
1GBKP37W6G3325116
1 = US built
G = GM manufactured
B = Chevrolet incomplete
K = 14,001 to 16,000 GVWR
P = Forward control cab 4x2 drive
3 = 1 ton series
7 = Motor home chassis
W = 7.4L (454) V8 4BBL gas
6 = check digit
G = 1986 year of manufacture
3 = Detroit, MI assembly plant

From this data and other charts in the manual, the 454 from 1982 to 1989 had 240 HP @ 3800 RPM and 375 ft-lbs @ 3200 RPM. The rear end gear ratio is 4:10 for 16000 GVWR vehicles equipped with 7.4L gas engines. The transmission is a TH475 through 1990, a three speed automatic with the following gear ratios:
1st - 2.48
2nd - 1.48
3rd - 1.00
Reverse - 2.10

Probably more info than you wanted but it sure can't hurt.
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Old 01-28-2007, 09:05 PM   #10
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well, no wander you guys get better gas mileage then me. MY '86 (85 chassis) 34.5 has 4.56 rear-end gears.
In my Chevy chassis manual that puts my GCVW at 19,000 pounds, but I read somewhere the the Th400/475 is only rated at 16,500 GCVW which is why mine has a Allison 545 rated at 32,000 GCVW. Maybe I need to change my rear gears.
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Old 01-28-2007, 10:48 PM   #11
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That's the tricky part, just what is the GCVW of these 345 beasties? Without getting up and braving the sub-freezing temps outside at the moment and finding the weight tag, I really don't know. One thread on here mentioned an aluminum tag on one of the rear differential cover bolts that shows exactly what the gear ratio is. My tag shows 4.10, but I get only 7 MPG on a good day and that's keeping the throttle between 55 and 62 MPH. I recently found and repaired a vacuum leak coming off the engine to the A/C dash controls. I'm hoping that will improve it at least a little. I've still got the stock carb, intake, exhaust, and ignition. I'm dreaming that one day I can get the mods in place to take me down the road at the unheard of 10 MPG that GlenCoombe routinely enjoys. What's the secret Glenn?
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Old 01-28-2007, 10:59 PM   #12
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Here's the thread, nice picture further down on the tag. Maybe I need to revisit what I think I have, 7 MPG really rots!
http://www.airforums.com/forum...0-a-19467.html
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Old 01-28-2007, 11:33 PM   #13
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I've been getting a consistant 9 mpg without my toad and 8 with in our 345. The biggest difference in mileage came when I installed headers and a free flow 2 1/2" exhaust. I also rebuilt the carb, replaced all of the vacuum lines, removed all of the smog pumps and replaced the ignition (stock).

The other big change I made was to drive at or below 60 mph on almost every trip. I would like to upgrade to either a four speed tranny, or install a Gear Vendors along with fuel injection. I think if I could drop the RPMs down to about 2200 at 65 things would be just about perfect.

Of course...that's only if I don't do the full diesel someday
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Old 01-30-2007, 09:36 PM   #14
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1988 34.5' Airstream 345
CUMMING , GA
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Ron,

Will post some picks as soon as i get the thermos bottle out of the shop. am having new shocks installed. wanted bilsteins but the rv shop i went to couldn't figure out which ones to use so we opted for ranchos. by the way, i got 6.5 mpg bringing it up to atlanta from the lot in florida.
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