TH400 - when is it supposed to shift gears - The 1947 - Present Chevrolet & GMC Truck Message Board Network

kikkegek · 03-31-2011, 04:22 PM

hi there,

My car seems to be running just fine. You can allmost not even feel it shift gears, thats how smooth the ride is. Only when I open up the throttle a lot you can feel it shift from 2nd to 3rd gear.

Now usually it will change from 1st to 2nd pretty fast...anywhere between 6 to 12 mph....and then it will change from 2nd to 3rd at about 20 to 25 mph.

is this normal for a TH400 with 1:4.1 gear ratio?

I recently connected a TACH and it shows about 3000rpm at 55 mph...

also I have never ever been able to let the tranny downshift when I hit the throttle hard.

03-31-2011, 04:22 PM	#1
kikkegek Registered User Join Date: Aug 2010 Location: Netherlands, The Hague Posts: 1,518	TH400 - when is it supposed to shift gears hi there, My car seems to be running just fine. You can allmost not even feel it shift gears, thats how smooth the ride is. Only when I open up the throttle a lot you can feel it shift from 2nd to 3rd gear. Now usually it will change from 1st to 2nd pretty fast...anywhere between 6 to 12 mph....and then it will change from 2nd to 3rd at about 20 to 25 mph. is this normal for a TH400 with 1:4.1 gear ratio? I recently connected a TACH and it shows about 3000rpm at 55 mph... also I have never ever been able to let the tranny downshift when I hit the throttle hard. __________________ My dreamride / project:1977 GMC C15 Suburban In storage: Monster - 1974 GMC Suburban 25hundred Sold : Chevrolet Suburban K20 Silverado 1986 Guide: real HID projectors for 4x6 headlights link: DIY LED TAILLIGHTS



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