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Old 01-13-2015, 09:02 PM   #2918 (permalink)
Mad (Sean) Max
smackzed's Avatar
Join Date: Jan 2009
Posts: 9,602

Originally Posted by legendman View Post
From the ad...

Maximum Speeds At Governed RPM
High Range 1st 25 mph (40.2 kph)
2nd 35 mph (56.3 kph)
Drv 55 mph (88.5 kph)
Rev 9 mph (24.5 kph)
Maximum Speeds At Governed RPM
Low Range 1st 14 mph (22.5 kph)
2nd 23 mph (37.0 kph)
Drv 35 mph (56.3 kph)
Rev 6 mph ( 9.6 kph)

How do they govern these things?
As the turbos said the RPM is governed...somewhwere around 4000rpm, which is weird because the ad says that the max speed in D (1:1 since it's TH400) is 55mph/88kmh. I just did an RPM calculator and @ 55mph with 3.08s (the blazer CUCVs had 3.08's correct) and I assumed a 31" tire RPM would be more like 1900, so in theory you should be able to bury the needle in one of those Blazers.

If the gearing had been changed all the way up to 4.56 and kept the 31" tires it would still have 1000 rpm more before it hit governed max, so i don't quite know what that guy is talking about

I know with both my trucks and 4 different engines I've been able to bury the needle with each one. Th400 and 4.10s
'87 GMC R2500 380,000km
AM/FM Radio -rebar except for engine trans and misc suspension parts

'90 GMC R3500 srw 3+3 310 000kms
CD player that eats CDs
No matter what Dieselplace may say, I am not a diesel technician, nor expert or specialist. Just a cheap guy with old truck that needs to run

Last edited by smackzed; 01-13-2015 at 09:06 PM.
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