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Received: with LISTAR (v0.129a; list perf-list); Wed, 12 Jul 2000 12:08:30 -0400 (EDT)
Date: Wed, 12 Jul 2000 12:08:30 -0400 (EDT)
From: Ford Truck Enthusiasts List Server ford-trucks.com>
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Subject: perf-list Digest V2000 #98
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From: "Joel Thomas" prodigy.net>
Subject: Re: 300I6 needs more power
Date: Tue, 11 Jul 2000 23:01:05 -0500
this is an example not exactly right
if you have a 3.08's and you are going 45 up a hill with the 300I6 and it bogs down it is because it is trying to pull with a RPM(revolutions per minute)that is under it powerband(the rpms the engine make the most power)like it may be dropping down to 1300rpm but if you downshift into
3rd gear you would have to slow down to probably around 35(not right jsut an example)and then you could drive back up to 50 and shift to 4th but then it would bog down again, i know you could drive 35 and forget about but if he doesn't want to or can't because high traffic area. dropping in a 3.55 or 3.73 would make that same 4th gear at 45 have an rpm of around 2500 well in the powerband of the 300I6 so you could actually speed up to 50 and hold till the top of the hill.
now do you get the idea of usefull powerband and rearend gears.
we offroaders drop our axle gears to around 4.56 and we can crawl but the top speed is limited to around 80 because you get out of the engines powerband 4500rpm and it wont pull it anymore.
>I agree that it's all about making the engine run within its power band.
But axle gearing doesn't CHANGE the available engine power, it merely
changes the road speed at which you realize that power. So does
downshifting! Recall this discussion started with a 300 I-6 equipped with a
5-speed tranny, plenty of ratio's, so downshifting is definitely an option.
This is precisely why I did not recommend the axle swap proposed.
>Downshifting is free.
Well, after 180K miles with my 97 Expedition (XLT, 4x2, 4.6L, 3.31LS), it
would seem that my 4R70W transmission is starting to go south. I'm
beginning to see a hesitation and slippage shifting out of overdrive,
especially when I'm only running about 45mph and lugging the 4.6L engine up
a small hill. I also had a failed shift from 3-->2 under heavy acceleration
(foot on the floor) a few days ago. The tranny fluid only has about 10K
miles on it, so it is nice and clean.
That being said, it's time for me to look into transmission
rebuilds/replacement. I could have an independant shop do the rebuild, but
I would rather have Ford put a brand new transmission in. Does anyone know
an approximate cost for a new (preferably not Ford-rebuilt) 4R70W? What is
the normal price range for a rebuild, Ford or otherwise?
Final question... When the transmission gets rebuilt/replaced, I was
thinking about adding a shift kit to firm things up a little bit. Has
anyone done this to this transmission? If so, what does it take to install?
I would like to have whoever does the rebuild/replacement to add the shift
kit. Does anyone have suggestions as to brand and possible price range? Or,
is this ill-advised for my truck?
I hope some of that makes sense =) If anyone has some information, tips,
etc., I would appreciate hearing from you.
Date: Wed, 12 Jul 2000 10:06:51 -0700 (PDT)
From: shane san miguel yahoo.com>
Subject: Re: Impending Transmission Problems
Wow! That's pretty impressive mileage.
Don't know specifics about the 4R70W but I do know an
AOD or AODE rebuild can set you back 700-1200 bucks.
I haven't seen a shift kit for your tranny, doesn't
mean it's non-existant though.
55 F100 5.0
--- tvsjr sprynet.com wrote:
> Well, after 180K miles with my 97 Expedition (XLT,
> 4x2, 4.6L, 3.31LS), it
> would seem that my 4R70W transmission is starting to
> go south. I'm
> beginning to see a hesitation and slippage shifting
> out of overdrive,
> especially when I'm only running about 45mph and
> lugging the 4.6L engine up
> a small hill. I also had a failed shift from 3-->2
> under heavy acceleration
> (foot on the floor) a few days ago. The tranny fluid
> only has about 10K
> miles on it, so it is nice and clean.
> That being said, it's time for me to look into
> rebuilds/replacement. I could have an independant
> shop do the rebuild, but
> I would rather have Ford put a brand new
> transmission in. Does anyone know
> an approximate cost for a new (preferably not
> Ford-rebuilt) 4R70W? What is
> the normal price range for a rebuild, Ford or
> Final question... When the transmission gets
> rebuilt/replaced, I was
> thinking about adding a shift kit to firm things up
> a little bit. Has
> anyone done this to this transmission? If so, what
> does it take to install?
> I would like to have whoever does the
> rebuild/replacement to add the shift
> kit. Does anyone have suggestions as to brand and
> possible price range? Or,
> is this ill-advised for my truck?
> I hope some of that makes sense =) If anyone has
> some information, tips,
> etc., I would appreciate hearing from you.
> To unsubscribe:
> Please remove this footer when replying.
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